Another ION Rocker review/preview that didn't read as glowingly as others I have seen:
Functionality: 9
"One thing thats missing, however, is the ability to differentiate between single or double hits. You can drum roll no problem. Strike two different pads simultaneously and the kit as well as the game will react as it should, producing two distinct sounds. But if you hit the same pad with both sticks simultaneously, it sounds the same as if you hit it with just one. This could be a part of Rock Band 2s limitations. Without being able to test the Drum Rocker with a module, however, theres no way of knowing if this is a limitation of the kit itself."
Drum Pads: 9.5
"They have just the right amount of bounce its not on par with a real, non-electronic drum set but is certainly comparable to other electronic kits."
Cymbals: 8.5
"If you hit a drum pad hard enough, theres a good chance one of the cymbals will react slightly. When this happened, I assumed that it was because of (A) the proximity of the cymbal to the pad I was hitting, or (B) the base isnt sturdy enough to withstand the vibration of my hit, which (via vibration) makes it way to the cymbal and causes it to react.
When bringing this up to Ion Audio, the company insisted that my unit must be defective. But when banging on the Yamaha DXPL, the exact same thing happened. That kit sells for $700. In chatting with a Guitar Center employee, I learned that cymbal reactions like this are not uncommon for low-end kits."
Pedal: 8.2
"it seems that glue is used to attach the spring to the top part of the pedal. The bottom is securely screwed down, but there are no screws on the top just a greasy-looking brown substance. The Simmons pedal was designed the same way, and though this may be normal for electronic and/or acoustic kits, it seems a little cheap. After months or years of heavy use, the glue could break down. Screws are less likely to do so and, if necessary, could be replaced more easily."
Drum Kit Base: 6
Adjustability: 5
Setup and Instructions: 3
Clamp/Wing-Nut Reliability: Questionable
"Ion Audio touts the Drum Rocker for being adjustable and configurable. Thats likely why every image I see (from Game Informer magazine to the companys own Web site) is different. But that doesnt explain why the instructional setup is not optimal, nor does it convey that in order to make any significant adjustment, you have to loosen several screws, hold the arm or leg in place to prevent it from falling, and screw it back together. This is not a long process but its not a quick one either. Its tedious and uninviting I didnt appreciate having to do this every time I wanted to make an adjustment."
"After a few days of use, the clamp holding the Xbox 360 module (the device that connects the instruments to your console) broke off. This occurred while the wing-nut was being loosened (to make an adjustment, of course). Ion Audio assured me that this only happened because my unit was defective. But that wasnt the only clamp that broke. Two weeks later, one of my cymbals became unusable when its wing-nut fell apart (also while being loosened).
I want to believe that if I purchased a Drum Rocker of my own that the clamps would be more reliable. But honestly, none of the ones provided with this review unit not even the ones that stayed together looked very sturdy. One could argue that this is not uncommon for low-end drum kits, just like the cymbal reaction problem. After all, the Simmons kit had a very similar design (complete with cheap wing-nuts). But Im still skeptical and less satisfied than I would have liked considering the hefty price tag."
Verdict: 8.3
"I want to recommend the Drum Rocker. I want to own one myself. But the setup, adjustment and reliability issues are a bit troubling. Also, without being able to test the kit with a drum module in-store, Ion Audio is asking consumers to take a leap of faith and spend about $600 ($300 for the Drum Rocker and $300+ for a decent module) without knowing how it will perform as a standalone kit. If you want it solely for the best Rock Band performance possible, this is a must-buy peripheral. But unless you can accept its flaws, the Drum Rocker is not recommended as an all-in-one drum solution."
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http://xbox360.gamezone.com/gzreviews/p36453.htm for the full review (I only copy and pasted selected quotes out of politeness for the site, go there to read the full thing)