Thanks for the replies, folks. I just came back from the pro shop with my bow.
Here's what he told me: (maybe he's also learning some about these different combos and carbon arrows?!)
--The D loop WITH a retention rest makes it hard(impossible)to tune with my GoldTip arrows. They tried the BD Zapper and others and couldn't get the arrow to shoot straight. Apparently the loop makes my Jennings CM Xtreme very sensitive to spine strenth. Gold Tips are 5575s and I'm set at around 58lbs.
So now...the D-loop is gone - I'll be shooting off the string - and I'm back to a two-prong rest (now a nicer Quik-Tune one) even trade and no charge for the work. To my bowyer's credit, it was I, the novice, who wanted the D-loop installed as well as the biscuit rest. I'm going to try a NAP (I think it's a 'Quik-Flip'?) arrow retainer to keep my arrow in place and otherwise Keep It Simple (stupid) from now on.
I'm glad I decided to resolve things before shooting at a deer! I'll shoot tomorrow and give a report once I see how it shoots.
--Dan

Dan

The arrow retainer is a "FastFlip" by NAP, not a "QuickFlip"!
Looks like a solid product from the NAP website. I just want a quality system to hold the arrow on the rest while I'm sitting in stand or still-hunting!
--Dan

Dan

There is only one rest I'll ever use!
Muzzy, Zero Effect!!!
I was paper tuned after one 1/4" adjustment to my knock point.
No more fletchings hit or arrows falling off while drawing back.
One of the best investments I ever made!!!

I have never used the WB but my huntin buddy did and we do alot of practicing in the summer. Especially last summer cause i broke my leg. We usually shoot an average of 60-100 arrows a day or more until hunting season. After about 500 shots you could notice the WB starting to get bent and worn down tips. It would keep getting worse and worse to the point where my friend had to start changing his pins cause it was really affecting the arrow flight. It also screwed up the fletching on his arrows cause he uses feathers instead of veins. I have had my rest for 6 years now and havent had a problem. It is just 2 little metal rods that hold the arrow and have white plastic caps over them which have worn down a little. I found out that once they have worn down a little they actually hold my arrow in unless i turn my bow upside down.

The wisker bisquet rocks. been using one for two years. and am paper tuned with perfect bullet holes. and can shoot my knocks off at will from 20 yards. also i use a string loop and it performs as expected.
As far as getting good groups its all in the setup and the shooter. the biggest part of the setup is properly spined arrows. If they are, then set up is a breeze and perfect flight can be acheived even without vanes.
yes the wb does wear out but replacements are cheap. I also shoot feathers and after about 1000 shots with the same arrow you can see that it is taking its toll on them but if they are fletched properly they ought to be good for another 1 or 2 thousand shots.
so to me id say the pro of having a rock solid dead simple arrow rest out weighs any of the cons ive noticed
just my 2 cents
Bob

I have shot a bow exactly like mine with an MZE (I have a WB). The diference was amazing. The MZE way outperformed my WB in every way (the guy had gotten crafty with some mole skin and tubing which held the arrow in place when not drawn)except if I were to turn my bow completely upside down. The MZE is faster, quieter, and improves accuraccy dramaticaly especially at longer distances. I just think that at $125.00 Muzzy is really taking advantage of their customers. I can't see why any rest should cost over 100 bucks. I have not had any experience with other fall away rests but can assume they will offer the same benefits. Although the WB has an advantage in the area of keeping the arrow on the rest no matter what, if I had the dough to buy a new rest I'd drop the WB and never look back. I'd dump the meal loop too.

That Muzzy is great until it fails when you really need it. I say keep it simple and the wb is dead simple.

Bob