I have yet to have a problem with my 220ST. The local Police Department is slowly phasing in the 220R's and doing away with the 229's they used to carry, and they have reported no problems.
And yes, I was at OO today and he's expecting the 220SAO's very soon. I'm dying to get to play with one! There's not supposed to be anything "X-5ish" about it. Same feel, look and holsters as the 220, but with a frame-mounted safety and SA trigger.