The P90/KP90's were great .45's. Hard to beat, if you don't mind rather large frame, single stacks with traditional double action (DA/SA) triggers.
I bought one back when the KP90DC (stainless, decock-only) model was new. I initially had to return it because of a weird galling problem, with the hammer gouging the bottom of the pick-up rail. Ruger replaced the slide, saying it had been caused by an unrecognized heat treat problem.
I ran the gun long and hard for many years. It was robust, decently accurate and as reliable as I could ever expect.
I eventually had to replace some assorted parts over the years (extractor, firing pin, mag catch, a couple of guide rods). One of the folks from Ruger once jokingly told me that I'd used mine hard enough that I ought to consider replacing it with a new one.
They eventually bumped up the tension of the recoil spring for the P90 (it was originally the same as that used in the P85/89), but that was also back in the days when I experimented with some different recoil springs, as I was using some stout +P loads from time to time back then. I even tried a P91 recoil spring (the factory sent me one to try), but it was too strong for regular pressure loads. I either got empties against my head or the slide short-stroked at times.
I ordered some new magazines after they'd revised them to allow loading 8 rounds. I don't particular care for the folded-leaf follower and short spring used to let the 8th round fit in the mag, myself, but I do rather like the added dimple pressed into the mag lips.
I was told by someone at the factory that they'd added the mag lips after studying their P97, and considering the number of their customers who were apparently using a lot of hard-recoiling +P loads. The gentleman said the newly added dimples helped prevent the top round from being displaced under the recoil of the harder kicking loads (forward, jumping out from under the mag lips).
I used the new mag bodies (added to my more than 15+ other older P90 mags), but with old style followers and springs, so they're back to being 7-rd mags.
I still own that KP90DC, and even take it to the range now and again to run it through a qual course of fire and do some training drills with it. Nice example of an older aluminum-framed single stack TDA.
Personally, I think it was a mistake for Ruger to stop production of the P90's, just like I regret S&W halting commercial production of the 3rd gen's. Oh well. Time and progress march on ... and everyone seems to want a plastic gun.
I never cared for the P97 I tried on our range (belonging to a retired guy), nor did I care for the P345 I idly picked up to handle on display in a store some years ago. I'll keep my P90DC (and continue to hang onto the small collection of spare parts I collected over the years).
It never replaced my 1911's, but it's a great metal .45 pistol.
BTW, I've known a handful of guys who carried P90's as either off-duty weapons or private citizen CCW's, and they were all, as I recall, fairly impressed and well pleased with their choices. Not a commonly seen gun, anymore, but still a good one.
Congrats.
Just my thoughts.