Tried one of these at Elex a few years ago attached to a mains drill when it was new to the market and wasn't that impressed with it for the cost and the ongoing blade costs
Definitely less work - though I wouldn't call it so much a thorough 'test'.
Watching that video the battery drilling machine they were using sounded like it was struggling and it didn't appear to be as quick as the manufacturers claim
At £300 and around £40 for a replacement blade set it is not a cheap piece of equipment and I don't see it being any quicker than a multitool and £40 buys a lot of multitool blades