After another two months of using their service consistently and with all the negative comments I read regarding Orbit in the last couple of months, I would like to highlight once again the exceptional job Piwi247 is doing.
I am doing 95% of my betting with them now, and I have been with them since 5 months+ - never had any issue with them.
If you want to use Betfair exchange, Piwi247 is your safest bet.