I've casually used this for a couple of weekends so far with good results. This week I'll be constructing about 10 face frames using it. I'm looking forward to the process.
I would like to see a couple of improvements. First, a secure place to keep the bench dogs and joining pieces. I'm afraid they will get lost in transport.
Second, Some kind of handle that could slide in the track to allow for easier carrying.
Overall, it's expensive, but useful, quality tools are worth it!