I purchased this gun a while back at Big5 Sporting Goods and since then have done a couple of mods to it. The first thing I did was take it apart and lube tune it. It shoots a LOT smoother since that was done, it really tamed down the firing cycle. I also added a GTX trigger blade replacement that I purchased from PSP Airguns. This mod alone made it shoot like a different gun. It reduced the trigger pull from over 5lbs stock to a little less than 2 lbs. The trigger upgrade is worth every penny in this gun since the stock trigger pull is WAY to heavy. I am able to shoot ragged one holers at 2o yards easy with this gun now, since the mods.
I also topped it off with a Center Point power class 4-16x56mmAO red/green illuminated reticle scope. This is the scope I won a few months ago in the Center Point scope giveaway(Thanks Josh!). I have to say I am very happy with this scope so far. It has stood up to the springer recoil with no damage yet. The optics are very clear on this scope and with the large objective it is easy to acquire your target with such a wide field of view. I haven't done much low light shooting so I haven't really tested the illuminated reticle feature out yet. But from what I can tell it seems to be pretty effective. This scope is a great addition to the Quest and I am happy with the combo. I really enjoy shooting this gun.
The only other thing I may do to it is to install a muzzle brake in the future. I will most likely get one of Rich in Mich. custom brakes as he makes some for the Quest line of guns.