I've used Intellicad since it was launched by VISIO (Intellicad 98, if memory serves)
Just upgraded my CMS version to version 10. ($89 or £69 here in the UK).
I'm still running 9 atm as the upgrades are effectively a NEW install, which is a pain, and I'm putting that off.
Yes it does not have ALL the functionality of Autocad, but for the price........
I don't use 3rd party ad-ons, so can't comment there.
I have found that customisation is just the same as in Autocad, I can load my old mnu files.
It will depend on what you want from it, is it 2D or3D
here are a couple of images of work I have done in Icad. (note: images were saved from Detect3D
![](https://serving.photos.photobox.com/668863902a355a065f682c5e6fbe83169383cc2a624716b43678c526858351e7c2b931e5.jpg)
![](https://serving.photos.photobox.com/848096277264cb4de890deb37dcfc5f030b42b0148d3b32f77b27a6518209e858af0c5fd.jpg)
S.