All this dolly talk and Drld's comment about not having much time with the Hustler gave me the idea to write a little column/review of it. Anybody can go to the website and download the specs but here is a Dolly Grip's perspective..
First are the pros:
The sideboard system is the best I've seen on any dolly. It's also the heaviest- with good reason. It is a sliding system. Loosening a knob under the sideboard allows you to slide it all the way forward, or back. There is also a reciever for a seat at the front of the board. Now having the dolly on the "dumb" side is not as big a deal. The front board also extends and has seat receivers. The boards are so heavy because of the reinforcement and the extra mechanism for sliding.
The arm has a 750 lb capacity. A jib arm can be mounted directly on it, and it can still boom up and down. On a show a couple of years ago, I mounted a 4' ubangi, and two 12" risers, had the operator stand on the ubangi and boomed up and pushed in up a staircase rail. I wouldn't have tried it on a Hybrid but the Hustler 4 didn't even blink.
6 lifts to a charge.
The improved arm is pretty rigid.
Every Hustler I've gotten has a pristine arm. The movement and the actuation has been perfect. I don't know if this is because the 4's have lower mileage because they're relatively new or what, but they've been great.
The low mode (starship Enterprise) is excellent, with footpegs. The leveling head can be removed and a seat attached in it's place.
It's extremely stable.
It has roundy-round.
It's a heavy sunofagun at 465lbs. (This is also a plus in other ways).
The sideboards are very heavy, and grab it wrong and you could lose a fingernail.
I'm not a fan of the brake. It's engaged by pushing it down and pushing in a button on the side. It's sometimes hard to engage and if not engaged properly, can pop out during a take with a loud noise.
Low ground clearance. This ain't the dolly you want in a swamp, or the mountains.
Overall, though, it's my favorite. I still use Hybrids for rough locations, but in a studio, or on asphalt you can't beat it.