I find springers to be relaxing and even Zen like to shoot, especially when I'm alone. When the compressor craps out and the Orings fail, the springer continues to perform.
I'm using the donny fatboy that comes with changeable caliber parts (.177-.30) on my .22 Wildcat compact. I started with the .22 insert but changed it to the .25 insert because of poi shifts. All is well now.
I love the micro quick tuner and they make the same one for the wildcat from what I understand. I have been tempted to buy but my Wildcat shoots so well I just haven't messed with the tune.
Most "shops" are in the business of selling new guns, not buying used guns. buying a used gun is a risk to re-sell with any profit margin. Like a used car, your better off selling it yourself than trading in.