The lines are nice. I like the pivot collar, looks nice in the spare design.
Bohler Uddeholm M390 is often regarded as the first among equals when it comes to super steels -- although CPM-20CV and CTS-204P are just about impossible to tell apart chemically, and for that matter in any other way as well, M390 has a habit of turning out just a fraction of a hair better on some tests that are designed to simulate, like, years of wear. That may boil down to a slightly better PM technology producing a slightly purer and more even alloy matrix, or it might just be conventional wisdom at work and there's really no meaningful difference between the three steels. Whatever the difference, M390's good stuff.
Slip joints aren't really my thing, or I might pick one up. Spent too long pissing around with them as a kid to be all that nostalgic for them now, and once you get used to using locked blades, it's hard to go back. It's not a quality issue -- the truth is if people use them purposefully they're just fine, and they're less legally controlled and more socially acceptable than pulling out some bigass lockback, and a lot of people are making slipjoints again so clearly there's a demand. Just not from me.