I've owned that scope, sold it and don't miss it. It wasn't sharp at any magnification and was really quite bad at 10x. The fixed parallax (focus) was a factor. This is generally considered the dog of the PST lineup.
If you just hae to go PST, the FFP 2.5-10x32 model, which costs more, has much better glass. MUCH better. But it also has FFP, which isn't needed in that magnification range and makes the reticle extremely thin at 2.5x. I've also owned and sold that one!
If you like that general magnification and size range, the SWFA SS 3-9x42mm is a much nicer scope for $599. Link below. I own three and am not trying to sell mine.
http://swfa.com/SWFA-SS-3-9x42-Tactical-30mm-Riflescope-P50716.aspx
If your budget is a bit more and you like really nice scopes, the Bushnell Elite Tactical 3-12x44mm is an AWESOME scope for $750 or so. It's in a whole league above the PST's if you ask me - glass quality, construction quality, reticle, turrets, everything.
http://www.opticsplanet.com/bushnell-elite-tactical-3-12x44mm-rifle-scope.html
There are also various other good options, even the much lower priced Burris FF-E1 3-9x40 is a pretty nice scope with clear glass and a good reticle, for a street price around $200 or less. I may sound like I'm piling on, but the PST line has been the biggest disappointment of any scope line I've tried, and I've had four (the two above and both SFP and FFP versions of the 4-16x50, which have murky glass above 13x. However, I recently got to look through a 6-24x50 PST and it had pretty good glass.)