I have shot both guns and both are pretty fast. The dm4 was easier to hold a good rate of fire with, but the shcktech timmy was fast as hell too. The only things I didn't like about the dm4 is that it is ugly in my opinion. The only way I could get it to shoot fast was to rake the trigger. It wasn't as easy to walk as the timmy. The timmy was fast just walking the trigger like normal, but I could shoot the dm4 really really fast by lightly raking the trigger, which I didn't really like because I personally feel more comfortable being able to hold the gun in my shooting hand and still being able to rip. I did not like holding the dm4 in my left hand and raking it with my right. The other thing about the dm4 that I have never seen addressed yet was that it was a massive air hog. It was worse than my 03 shocker with the stock bolt. I know everybody said that 03 shockers were hogs before the HE bolt came out, but the dm4 really sucked down the gas fast. The timmy was much more efficient by a long shot, and was way lighter than the dm4.
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