I'm overall a pretty big fan. I think it's a great value compared to the Innovativ carts. Tricked out with Steadicam accessories, it's still cheaper than a base Innovativ of comparable size. The build quality is good, and you can collapse it without tools as well. It's constructed solidly and you can get custom color options if you like (I have all black). I also went for the larger 10" wheels Marty sells it with which I feel are worth it. It is heavy though, especially with the larger wheels. That could be a factor if you fly a lot for travel jobs. I like the vest hanger/handle better than the Innovativ equivalent. If you want, you could also modify the cart to take beach wheels for working on sand.
At the time I bought mine, Marty was redesigning the bumper for his mast, and he didn't have a bumper available. I'm not sure where he landed on that. I ended up getting a bumper from backstage which fits the mast he's using which is from Modern. I would look into that if Marty still isn't selling bumpers. @Alex van Putten did the same for his Yeager Pro and I believe he has the very first Yeager Pro cart.