I’ve been using Racebets.com for over a year – always found them excellent. They’re a tad slower than the big boys when it comes to paying out, but the money still arrives within 24 hours – it’s not like they take several days.
Their live chat works fine if there is an issue with something (only had to test that once or twice at the most, but the most recent was just last week [about an antepost bet] which is why I remember) and I’ve never had a problem with them.
I’m persona non grata at half of the BOGs bookies now, but Racebets haven’t shut me down yet, even though I know I’ve taken money from them these last 12 months. That also strikes me as a positive sign.