Received and installed my Intertap FCs today, replacing two Perlick 630SS faucets that I bought before the 650SS was released. Now all 8 of my taps have FC, 6 Perlick 650SS, 2 Intertap FC. A brief inspection and side-by-side gives me the following impressions:
1) Machining work is cleaner on the Perlicks. I imagine if it's bad enough it could lead to excessive foaming. Fortunately I didn't have that problem on the two pours I made from each tap.
2) Perlicks have a steeper angle on the spout, meaning the Intertap sticks out about an extra half inch. Perlick claims the steeper angle leads to fewer drips, but I didn't notice any extra dripping on the two pours I made. Still too early to decide yet.
3) The tubing for the growler filler spout is huge! I can fit the tubing from my Perlick 600 series filler into the Intertap tubing. Since I routinely bottle from the tap using the growler filler, this could be a problem. Fortunately, the Perlick 600 series growler filler FITS the standard Intertap spout! That being said, I haven't tried running beer through it, so I'm only assuming that it won't leak.
4) The flow control mechanism is a little finicky. It seems like the most open position (on mine anyway) is right in the middle, with flow diminishing the higher AND lower you get from the midpoint. At either extreme the mechanism doesn't completely stop the flow, but it does slow it down to a bare trickle.
5) The pour wasn't as smooth with the Intertap as with the Perlick. It was almost like there was a bubble in the faucet that took a couple seconds to work out before the pour smoothed out.
Again, these are just my first impressions from installing the faucets and testing them out over the course of a few minutes. Based purely on these first impressions I prefer the Perlick flow control mechanism over the Intertap, but the Intertap is still a pretty solid contender. When you factor in the enhanced functionality from the additional spouts it's a pretty sweet deal!
Since I don't have a nitrogen tank I can't test out the stout spout yet, so no data there, but I'm betting it'll be easier to change the spout than to change a whole faucet.