If it were me, I'd stick with name brands like Wilson or WeBoost -- it's easy to make a booster that increases signal strength shown on your phone, but is so noisy that the signal is lower quality that without the booster. You could get lucky and find a cheap booster that's perfectly tuned and working well, or you could get a bad one and it's really hard to know how well it's really working without signal testing equipment.
Plus, you're supposed to register the booster with your cellular company, and they may not agree to register an off brand.
And finally if you're mostly interested in data connectivity rather than making celluar calls, you might be better off with a roof mounted hotspot since they'll use multiple antennas with MIMO to get faster bandwidth than you'll get through most boosters.