Never heard of Bravex. The inexpensive TAVs are all made in China and sold by many different sellers. What you get from Bravex may be the same quality that you would get from any other seller at the same price. If you are looking for support from the seller you might as well get it from them. I'm not sure how much support you would get from an ebay seller.
If I get another TAV I would first contact the seller to make sure what I'm getting has a 5/8" jackshaft with a 3/16" key. Some of them come with a 16mm jackshaft and 5mm key. If you plan on a gearing change you want the 5/8" jackshaft. I was lucky on my first one and got a 5/8" jackshaft.