I'm a light user, so I don't have any "real world" review, but I do own a Speedster.
I got it because it was the cheapest ATS-34 I have seen, and I like Zytel (lite weight), and I really favor lockbacks.. I like their interpretation of Zytel. It's kind of a semi-transluscent grey, but nice, and feels strong. Thicker handles than Delica/Endura. The "hole" is a little rough, but it opens well. I find a rough hole opens better than the bead blast hole say, on my EZOut.
My complaints: I find the handle too curved for comfort. It really has a radical handle curve, it does not fit my hand well Also, the large groove that allows you to get to the opening hole looks good, but is not ergonomic - it is too small for two fingers and too large for one. the clip is very secure - too secure for any kind of speed draw. It will get hung up on th epocket every time.
Mine is plain edge, but one interesting thing that would make me want the serrated is that they are double-ground - it's serrated on both sides, which is very unusual.
