I have called the seller this morning in an effort to improve communications, I felt a little responsbile as I did kinda recommend them, he informed me they are a little short staffed at the moment but he will make an extra effort to correspond swiftly through ebay.

He informed me that he does stock the Selectable Sprint Booster - this is £185 the equivalent to $287. I spoke to him about getting a better price for a possible group buy, but he wanted an idea of numbers.

Personally, I think I'm gonna buy the standard one.