Hutch~n~Son Archery is pretty much correct. Most rests are a personal preference...Well, after you've had a few. I've owned 11 different drop rests and more than that of shoot through prong style rests and tried every version of the whisker biscuit. All worked well when properly set and following instructions. A couple should have never been released on the market. There's been a few discontinued that deserve a second chance. As much as I like NAP I can not suggest the Freedom rest brought out a couple of years back (I own one). Once you come to full draw you can not let up, creep the least bit or the safety will engage. The Trap Door was discontinued and I found it to my liking. No draw cord, you have to manually raise the rest. It also has a sensitivity adjustment for dropping the launch arm. I own one and have used it on bows with draw weight of some 30 pounds up to 70 pounds and it has performed flawlessly.
Okay, I usually tell it the way it is or through my experience. So telling it like it is probably part of why I'm not sponsored.
The Mantis probably wouldn't be on the market if it didn't work.
Pros and Cons do exist for just about any arrow rest. I have 3 drop aways in use at the present, the Limb Driver, Doodle Drop and the Apache. All work great, but...
I found the Limb Driver very nice for bows with harsh let offs, dropping off into the valley and hitting the wall. Here the Limb Driver raises immediately upon drawing and eliminates arrow bounce. It's draw back is the long draw cord. I'm forever hitting or catching it on something. Tightening the screw on the cord has to be watched. Too much and you can cut or weaken the cord.
The Doodle Drop came on a bow I bought and just plain liked it. It though seems cheap in the drop department. A lead weight drops the cradle. I would have thought a spring would be better (and Bodoodle has this on other rests). This rest has less tension on the draw cord than draw cord rest I know of.
The new NAP Apache seems to be one fine rest, a bit heavy compared to some, but then I don't care for the full capture cage and it will come off. I am not particularly fond of the tightening feature - The no tool to set feature. I have to tighten mine with brute force and then to loose I really have to strain or just use another allen to stick in the hole to break it loose.
The Qad you mentioned. A nice drop rest. Instructions say to manually raise the rest before drawing. I think the manual raise thing is more to give the full capture effect immediately as you can draw the bow and the rest will raise. The Qad has 5 variations, plain jane to all the bells and whistles and the 5th being camo...for another $15 or so. I kind wonder about the dollar spread, $50 up to $140.
Okay, my two cents.