Futures Broker Opinions (C2 compatibility)?

My current trading accounts are at Tradestation and Ally (moved from Tradeking) so it is not possible to autotrade any C2 futures systems (there are too many hoops to jump through to use Tradestation and the email scheme, and although C2’s compatible broker table shows that Ally offers futures trading, that is a mistake in the C2 table and Ally does not allow futures trading). Of the offered compatible brokers, does anyone have good or bad experiences they could share with the listed futures brokers … specifically with regard to autotrading C2 strategies (rather than platform features, etc.)?