i've used sportingbet.com for about 4 yrs without any major problems.
like any book, there are positives and negatives,
the positives are excellent customer service and prompt payouts, as well as a diversified
betting menu, from nfl & nba to turkish horse racing. also anytime a minor problem did occur,
it was always settled to my satisfaction by the
next morning ( there is a time difference).
some of the negatives are at times i have a little difficulty navigating their site, their parlay rules seem odd, and they sometimes implement "eccentric" rules.
overall i feel that the positives greatly outweigh the negatives and would highly recommend them.