They seem to position themselves in the market as a rival to Swytch, which is odd as Swytch only offer a front hub-powered motor, and Boost only offer a rear hub motor, although both offer the opportunity to customise rim and spoke colours which would probably clinch the sale for me, but the idea of a bottle battery isn't really for me, if I'm honest, and they added me to their mailing list before answering a query I had.
Not to be confused with Boost e-bikes, or Woosh, who have a presence on here, and sell both kits and e-bikes.