I did a Tekion migration last year. Severely understaffed company for the migration, CRM was super far from being ready even though the pitch deck showed it as completed. Ended up having to do the DMS only and postpone the CRM for 1 year based on their estimates of what I would consider "basic CRM functionality".
That being said, they're at least making an effort in this space, which should not go unnoticed. Moving from DealerTrack to Tekion, I'd do it again in a heartbeat. Just be wary of "all the things it can do", because some of those things are on a backlog even though the buttons are in the UI. The installation crew had a very different tone than the sales crew (as with a lot of vendors). It's also been a year since I did that migration, but that backlog was BIGGGG and we had to make internal changes fast to accomodate!