I had one at my disposal for 6 years, and used it all the time, digging, hauling logs out of brush
It was a REAL mini-excavator. treads, cab that would spin like a top (that's how you make a flat pad, use the blade to un-tilt the cab, then whirl around using the bucket to scrape off the high bits.)
What you linked to is a towable back-hoe. It will not have the power or speed that a true excavator has. Looks like the ones HF sells here in the states. If "looks*like*tools" sells it, it's not likely to be really durable. If it's cost is about the same as a rental, if you got 2 days of real work out of it, it might be worth it. Figure out what flavor of hydraulic fluid it drinks, and get some spare jugs, I'd expect it to seep a lot at the seals.
Be sure you can tow/maneuver it into the spots you want to use it at, because you will not move it much by hand. And leave it hitched to the tow vehicle for more stability.