Yeah, there is tons of stuff added since v16, but you would have a better idea of what would be most applicable to how you work. I would suggest looking at the
What's new section for v17 here and then when you reach the bottom of the page, click on the What's New in DataCAD 18 link at the lower right side of the page and continue thru each version's what new page to get a good overview of the main features added up to v23.
Once you have familiarized yourself a bit with what you might be interested in feel free to come back and ask questions about any specifics you might have and I am sure someone can help out.
Here are the things I actually use on a semi daily basis at a glance for each version from the What's New lists. Orange items are biggies, and blue are must haves for me personally. I did not go thru the list of configs or extended character codes below, just the main features.
v17:Mask by Hatch Pattern
Symbol ToolsSymbol Attribute Text
Changing Text
Changing MText and PText Line Factor
XREFs
The "Entity Properties Editor" for symbols and XREFs, accessed via the [Ctrl]+[Right-click] context menu, now displays the "Line Spacing Factor." This value is the line spacing factor/enlargement. It is also shown in the [Ctrl]+[Right-click]/Identify context menu, and in the list of information returned by the Identify command.
XREFs on locked layers can now be refreshed (but not reloaded).
Layer Manager
When "Keep Layer Manager Open" is checked on the Layer Manager, it will now remain on-screen throughout an editing session, even if all drawings are closed.GoTo Views
Previously, if a drawing contained more than 10 GoTo Views, and you accessed the second page of the list, chose Move View, picked a view to move, and then picked the view to move it in front of, DataCAD would revert to the first page of views when finished. Now, DataCAD remains on the page you were on when you began the process of moving the view.
v18Resolving Broken Links to DatabasesEdit Attribute MenuGet Snap EnhancementsNew 3D Edit MenusIdentify, Set All: Smart Arrows
Process XREFs
No Scroll Forward / Backward KeysFix Text TogglePersistent Layer Manager Hotkey
Color Menu Goes Directly To Dialog
Edit Symbol Fields Dialogv19AEC File Repair - HUGE! Worth the upgrade alone, get's better in v23!
Program Preferences - Also HUGE! Makes most important Config settings accessible from the program prefs dialog.
New Ellipse Creation MethodsPlot Scale Dropdown / Print IconSymbol Browser: Flatten to ZeroMeasures: To ClipboardCustom Support Path
Wide Menu Labels
Symbol Browser: Audit Symbol Files - Helpful to do a once in a while audit/cleanup of my symbol files to help remove any bad entities from them. Just browse your symbol library folder structure with the Symbol Browser.
Symbol Editor: Inherit Parent Input ModeNew Regen
Undo: Disable During Import
Symbol Browser: Windows Cursor
v20Symbol Layer Control - Maybe my most used feature of all since it was added. It does have a little remembering it's state glitch right now, but it is super powerful. Gets better as the versions increase.
The maximum number of Fence points has been increased (from 36) to 256 in Stretch
DataCAD will now save the Active layer upon a Symbol's creation.
It is now possible to Object Snap to the Absolute Zero indicator.
The display grids can now be set to a custom color.
A new toggle, Ignore CC (Clip Cubes), has been added to the symbol insert menu.
A new option, By Center, has been added to the Move, Drag menu.
For convenience, an 'Abs. Zero' option has been added to the Multi-scale Plotting, Layout menu.
A New Layer option has been added to the Layer, Import menu.
The Reload option is now available in the Symbol Browser's context menu, for loaded symbols, when browsing by folder.
v21Enhanced Softlock IntegrationImproved Symbol Layer ControlSymbol Layer ManagerSymbol Layer Manager: GoTo View Link OptionsSymbol Browser: Recent / Favorite Folder Manager:
New options have been added to the AEC File Repair dialog.
[Ctrl] + Clicking on a Symbol will now open the Symbol Layer Manager if Symbol Layer Control is set to Per Instance.
Added Check Spelling to the context menu for Text, PText, MText, Symbol Attribute Text, and Symbols.
Added the options, Half and Double to the Enlarge menu.A new option, Real-time Updating, has been added to the Persistent Layer Manager. If un-checked, the Layer Manager will only update its layer list when the dialog has the Focus.
Added a new Color Picker/Mixer to replace the previous one.
The Entity Properties Editor has been updated...
Added new options, Hatched, and Filled, to the Mask menu.
v22Symbol Browser Show Nested
Mask Selection in Geometry OffsetFat Cursor
Symbol Explode Include Off LayersXREF: Show Hatch / Show FillSymbol Insertion Point by CenterDelete to Recycle BinCreate Missing Folders - still needs a little work
v23Transparent Fills - Super awesome!
32 Bit Bitmaps (Alpha Channel) - Also super awesome!
New Image FormatsBatch Printing EnhancementsHatch Pattern Manager Advanced OptionsMulti-View Window Enhancements
Repair option is now available from the File pull-down menu when a drawing is open. - I haven't tried this yet, but would be handy if it works well.
Error Codes - Helps troubleshoot after running a repair.