Hello,
Remember what we all know: if it sounds to good to be true......
I just purchased a 400 BMS from County Motor Sports from the internet. It also sounded to good to be true but I did it anyway. What a mistake. This company, County Motor Sports has given me nothing but headaches over their "customer service" after the sale. They won't answer emails or voice mails concerning out of the box problems. ie. electric shift doesn't work and the display shuts off. If I had it to do again I would buy a name brand locally and have a chance at after sale service, even tho I would spend a lot more. Also remember: "you get what you pay for"!! customer Service after the sale is very important and well worth the extra cost!
Good luck.
Ike