I use the modify right now, I pretty much try any hopup version, I am very impressed with the flat. You just have to modify it to your set up or tastes.
Do not use the junk rubber that came with it. Grab a quality one, I use the Systema Energy, cut off the nub and sand flat, or even better, cut off both that and the groove channel, and flip the rubber around so that you have a 100% clean patch to use for the hop, I got extremely good results from doing that.
You need to super glue a tiny extra peice of rubber to act as a shim between the hop arm and the rubber, I noticed it needed a bit of extra firm and hop to it to really perform.
As Stealth said, it has to be perfectly centered, it takes a few tries to do, but when you do it like I found, it really is top notch.
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W1-5
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