I have a few different ones, all of them are actual quality and not knockoffs.
Grip Pod- the original VFG/bipod. The real ones don't weigh a couple pounds but will hold up. If you have a rifle that going to split the difference between quick handling and longer range, it's worth a look.
TangoDown stubby QR- Good if you're using it mostly as a hand stop. Attaches quickly, is decent. IMO, it's just fine, but not ideal.
LaRue FUG- three different end caps let you adjust the size, I prefer this QR release to the TD one, and just feels grippier. Not cheap by any means, but IMO, you get what you pay for.
If you want nothing more than a VFG, then go for the Magpul VFG and save your money. If you want something that feels great and is high quality, go with the LaRue.