I'm 6 feet tall and i find that, depending on the weight and dimensions of the load, i have to stoop a good bit more than i would like for a guy with the sort of back that prompted me to buy the thing in the first place. Someone who's hands are closer to the ground and/or doesn't have a bad back would find this less objectionable.
The carrying arm is quite deep(long?) so a good volume of equipment can be carried at once.
The wheels are solid so the cargo gets bounced around quite a bit and it likes only the most even of pavement. A nice smooth piece of tarmac and you're laughing.
The wheels are each secured by a pin that is the shape of a shepherd's crook and will gradually slip out of the hole on any terrain other than the aforementioned super-smooth tarmac. This has caused a wheel fall off and the 30KG power amp and its case to crash unceremoniously in a car park, a busy pavement, and a field. I lost one of the pins last time round.
Someone more technically-minded could likely bodge a replacement and have the trolley up and running again.
It folds away into a pleasingly small form, fits perfectly into the the passenger footwell of a toyota corolla and, with the exception of the connection between wheel and axle, is very sturdy.