Cheapo trigger, no tourny lock, no aftermarket grips
First, let me clarify that I'm using the older 32* E-frame, the one in the 2nd and 4th pictures up top, not the newer frame with the more standard grip style.
I got this frame with my Spyder Rodeo last year and it's done me well for woodsball play. I did have to put some tape on top of the trigger inside the frame to reduce the trigger pull, but aside from that I haven't done anything to it.
The stock trigger is a piece of crap. It works, but that's about all that's good about it. There's lots of slop (some of which can be taken up by the aforementioned tape mod) and the plastic is cheap, so the trigger actually flexes as you hit the switch. You can't walk it, period.
You can't replace the grips on the old frame, unfortunately. The frame is an odd design, so new grips don't fit right on it. The stock grips are ok, but they're brittle and they don't seal well to the frame.
There also isn't a tourny lock on the frame, as I discovered recently. Inconvenient:-|
All that said, it's better than the stock mechanical frame. The major issues I have with it are the cheapo trigger and lack of tourny lock.
The new one may be much better, but I'd recommend staying away from the old model unless you can find it for <$20. You can get older Kingman frames now for $35 on ebay if you look for a while, which is what I'm hunting for now.
I give it a 7, because it's functional and inexpensive. Would be an 8 if the trigger wasn't so cheap.