Admittedly, I've only shot two Escorts over the years however from what I've experienced the two I've shot suffered reliability issues. Wether it was the ammo, poor cleaning technique on the part of the owners, or just bad luck - I will never know, but just stating what my limited experience was.
While you may indeed get a good Escort that functions well, I'd never want to carry a .22 Rimfire as a SD gun due to the reliability issues of Rimfire ammo design. Even the highly coveted CCI brand which is the best and most consistent, occasionally will have a stinker in the box.
I can see buying an Escort as a collectible, plinker or conversation piece, but unless it was brand new in the original box with all accouterments, $450 is way on the high side IMO.