I'm using the HunterCam HD arm and my one complaint is that I get a noticeable amount of flex in the arm with my GL2 equiped with an XLR adapter (which is pretty heavy), extended life battery, shotgun mic, and wireless mic receiver. I'll be upgrading to the Pro arm for this fall to eliminate that problem. IMO I would rather have too much arm than not enough. While the flex isn't a make or break deal with this arm as you can live with it and work around it, but its more of a little nuance that I'd rather just not have to think about.

Overall I've been very pleased with my HD arm. Easy to set up, quiet, and has a good amount of reach/extension.