I have a quivalizer on my Perfexion and use a Tight Spot on my Katera XL. They both have their upsides and downsides for me. The Tight Spot allows you to tighten or loosen the grip on each arrow and you can remove arrows without fumbling or tipping your bow. The thing I don't like is having all the weight hanging off the side of my bow when I shoot.
The Quivalizer puts it's weight to use with slowing your pin down. In the wind you do have more pin drift, but for me, the drift is slower instead of the jerking sensation I get with the Tight Spot. The quivalizer is expensive and unless you have a decent amount of disposable income I recommend you find a shop and try it on your bow first. If you hunt in country where you could walk around with your arrow nocked all the time the quivalizer won't be any issue for getting in the way. If you hunt the thick brush of places like northern Idaho, West slope of the Cascades, or the coastal mountains like are in Oregon and Washington it could very well be one of the worst quivers you could buy. It would be pretty pointless to spend all that extra money just to always leave it mounted to you sight like the Tight Spot.
If you buy stabilizers that actually help slow your pin down like a Beestinger or Doinker, once you add a Tight Spot to that, the price is pretty much a wash.
One thing about the quivalizer that I haven't decided is a plus or minus is that if you shoot it like it comes from the factory the arrows are on the left hand side of the bow (I'm a right handed shooter) when it's mounted horizontal. I'm use to just grabbing the next arrow from the other side, but got to thinking about the cons of that. When I grab the arrow from my arrows from the right (like I do on my Tight Spot) I have to bring the arrow across my bow to nock it. This means bringing the broad head between me and the strings. With the arrows on the left you have to cant your bow to get to the arrows with your right hand but you never bring the broad head anywhere your strings. It creates one less opportunity for you to nick or cut your string with the broad head, my archery shop I use is always busiest with making strings in September and it's because of guys cutting their strings.
Both are great quivers but it just depends on the hunter which is the better.
