true, I've never met a person having a direct positive slippage experience. But that could be a nice marketing trick though for brokers to promote they can actually have positive requotes or slippages. Like a free lottery that you never win, but that's a nice feeling to know you do have a chance
I have finally decided to open a real trading account. I deposited $200 and started trading currency pairs, using 0,01 lots and 1:500 leverage. Well, these are not big volumes but I want to gradually move from demo trading to real one and such volumes are OK in this regard.