my understanding is that they are a copy cat of the Gitzo brand, so,, very similar features,, and such, but perhaps some quality trad-offs for less money ..
I personally use manfrotto tripod, I have both the aluminum and carbon fibre models. I like the release mechanism of manfrotto, Never been a fan of twist releases, but prefer levers, but
each their own.
I noticed at the last class I held, that the professionals all had heavy duty Gitzos, and the serious photographers had 50 50 between Gitzos and Manfrotto.
I really recommend going to a pro store, and checking out tripods in person, I don't think I would just buy one blindly.
but,, maybe the Giottos are great.....