I've used this joiner for aligning panels and attaching face frames.  The adjustments for angle, depth, and biscuit size are all very easy to use, and accurate.  The machine has plenty of power and cuts through hard maple with ease.  I would've given it a 5, however the small dust collection bag they provide with it seems to be useless (the chute keeps clogging).  I just use it without the bag and clean up afterwards.