Doug, I have a Stallion and I absolutely love it! It has fast become my favorite bow. Mine is a standard Stallion and is 51# @ 28".
At 8.6 grains per pound (433gr arrows) it is shooting 190fps. At 10.7 gpp it is shooting 175fps. (530gr arrows)
What can I say about this bow? The grip is IMHO one of the best there is. It fits my hand like it was made for it. The limbs are incredibly smooth. I've drawn it to about 29" with no perceptable stack. (I draw 27.5") It's certainly no slouch in the speed department.
When I first got the bow I was using the endless string that came with it. (I got it used and am not sure what the string is) With that string it was a little on the noisy side and had a tiny bit of vibration after the shot. I made up an 8 strand 450+ flemish string for it, wrapped the ends of the string with wool yarn, put in 2 woolie whisps and it is now dead quiet and completely dead in the hand. No vibration of any kind.
I like this bow so much I actually sold my DAS Master hunter due to lack of use. The Quinn delivered everything that the DAS did and did it with a better grip (for me) and a fraction of the cost.
I've been shooting it off the shelf with a GEREP rest. (one of the little felt pads that get stuck to the bottom of furniture legs, cut in half. One half on the shelf, one half on the side plate) It will accomodate an elevated rest but it shoots so good the way it is I haven't messed with it.
Don't let the simplicity and low cost of the bow fool you. It is one of the best bows out there at any price.