Bluehost is one of the world largest and most reputed web hosts. The only hosting solution from them is an Linux shared hosting to target at individuals, bloggers, small business and php developers. This solo product is so popular that it has made Bluehost as the 6th largest web hosts in US, serve for over 2 million domains and this number is still increasing at a speed of 70000/month.
Bluehost guarantee "Anytime Money Back". Their customer could get full money back within the first 30 days, and then a pro-rated refund after it if they cancel the account.