ok, you didn't give a good reason there.. just more of the same sweeping negatives.
I've used SB for about 13 years now, two different firms over that time, but both regulated in the UK.
The only problem with SB is that its mechanics, aimed at controlling short-term volatility risk to the company, means that its very hard to make a profit using SB as a day-trader, virtually impossible if your time-frame is minutes. Spreads expand and contract, and at times certain markets are unavailable although the underlying instrument is still being traded live in London or New York etc., but all you can do perhaps is enter and edit orders.
For long-term holds, UK SB firms are as reliable as any other method, you just have to work out if the costs and margin are right for you.