Here's my update after playing two rounds with these discs throwing them for almost all approach shots and all putts and doing some practice putting:
First, they're more overstable and have less glide than my 167 SE. No surprise there. The SE is probably about a 4-5/10 and in perfect condition. These are new. They have some nicks on them from the two rounds, but I don't anticipate them to change flight anytime soon and to be able to take a beating. They are less overstable than a new DX 170 Rhyno.
Second, they're heavier than I'm accustomed to for Rhynos. These are 174-175, so they're a little beefier than I'm used to. This is just an experience issue, I was missing putts with the (R-)Pros that I hit with my SE, likely because I wasn't putting as much oomph on it as I needed to.
Third, they fly very straight and slow with a good amount of fade. Not stupid amount, but a healthy amount. Very predictable flight, and you're not going to overthrow a shot with these like you could with a DX Teebird or Comet. I was getting them out to about 200'+ on my rusty post-winter throws. They also hit-and-sit like a Rhyno should.
Fourth, they might be my perfect putter as soon as I get the weight difference into my muscle memory. They are firm enough to bash the chains but have a tackiness to grab the chains. If you follow DGR's thoughts on a medium stiffness and medium grip putter is best for total basket area where a shot will go in, these might be perfect.