You are right about Colt in the sense that I wouldn't invest in them even if it was with your money. However, they do seem to have finally removed their collective heads from their rectums in terms of customer demand. My only hope is that it isn't too late.
In terms of actual autos, I've never had the opportunity to shoot a 10mm f/a. There are not a lot of them domestically, and the agencies we served never requested one. I've handled an MP10 at trade shows, but I didn't get to shoot it. I've had plenty of opportunity to shoot the MP5 and the UMP .40, but even they weren't that popular in our local LE crowd. Most of our LE went to the AR-15 or a derivative there-of, even for their sub-gun purposes. I loved our shop MP5, but if I were a domestic law enforcement armorer, I'd probably prefer the simplicity of maintenance and repair of the AR-15 over the (in my opinion) more accurate and better functioning MP series myself.
As to 10mm semi autos, I have a few to choose from, and I took four of them with me to the range the other day.
They each have their plusses and minuses, and taste is very subjective. That said, over-all, I like the Kimber best. It is the best combination of portability and shootability of all my 10mm guns. I've used it to win a bunch of pin matches, and I trust it enough to carry on a regular basis.
Purely in terms of shooting, I like my Sig 220 best. It is heavy, and I wouldn't want to carry it all day, but that heft is a real advantage when shooting unsupported or on the move. Next to no muzzle flip, even with some of the more stout 10mm loadings.
I like my new Delta a whole lot better than my older one, but I haven't had much trigger time with it yet. This was it's very first range visit. I shot it a lot better than I've ever shot the old Delta, but that wasn't a high bar to begin with.
Interestingly enough, my grouping with my Glock 40 at 25 yards is about as tight as my new Delta at 10 yards. Some of that is no doubt attributable to the longer barrel, but I must also begrudgingly give some of the credit to the Fast Fire. It still feels like more of a distraction than a help in use, but the results always surprise me.