I just completed the 7.21 upgrade on my alpha and i cut a door sample before and after the upgrade . The difference is incredible . Ill try to post photos , after the upgrade i cut 3/4 mdf 2 passes @7 ips the cut was as good as on a table saw . I used a 1/4 compression bit from centurion tooling and for the groove in the door pannel i used a 3/4 ball nose @4 ips .125 deep and it can go to paint without sanding. Its like a new machine. I would not give a second thought about the shopbot upgrade , go for it .