First of all, in case you didn't find it, here is another thread on this pedal:
Gibraltar G Class pedal
Yes, I own one. I like it. I also own an older IC, a Speed Cobra, and I recently parted with a Pearl Eliminator (all singles). For my style, blues and rock -- where I'm playing occasional fast stuff, but nothing terribly intricate -- all of these pedals perform admirably. There may be
minor differences, IMO, but, given the vast adjustability all of these pedals offer, you can get them all feeling roughly the same. As far as the "heavy" comments, I'm not sure what people mean by this. Is it the beater weight? If so, then yeah, it's a little heavy. I tried my IC beater on the G Class, and that definitely did change the feel of the pedal -- much lighter feel, but I couldn't get the same oomph and power out of it.
A common complaint I've seen online is that the metal Gibraltar logo cap on top the beater comes off. This cap is what the magnetic weights adhere to. If it comes off, you cannot use the provided magnetic weights. This also happened to mine, but a little bit of 5-minute epoxy took care of that.
As far as price/value goes...I bought mine used (like new) for $120. It's a great value at that point. Another pedal that intrigues me (but I haven't tried it) is the Gibraltar 9600 series. These can be had in chain, strap, or direct drive for $120-140. Looks like a nice pedal. I've tried the 9600 hi hats, as well as a 6600 series double pedal -- overall, I think Gibraltar is putting out some good stuff these days.