i have not purchased any equipment ( lighting, boom or tripods ) from amvona, but saw some of them when i visited the company in dedham, ma a few months ago. it looked like nice stuff, but i don't really know how rugged it is. ... i *know* my tiltall or my wood tripod/bogen head can take a beating cause i have been using them for 10 or 20 years ... but i don't know anyone who has anything made by amvona, or put their amvona equipment through the test of time.
some of the "reviews" may be telling. some folks buy the equipment thinking it is up to the task of taking a beating, but it falls short of the mark. i know when i was thinking of buying a "extra large soft box" from them, they were unable to confirm whether or not my speed ring would support their softbox, and if i had purchased it, and sent it back, there would be a restocking fee &C &C ... so i didn't bother.
while their stuff may seem like a deal, it may end up costing you $$ in end ( replacement cost, or not being able to hold your equipment )