i actually switched a few months ago to aquacave from MD, and I have no complaints. The service has been great, purchased MH reflectors, bulbs, temp controller - helpped a friend by a 6' marineland light, 60gal sump/fuge, and large octopus skimmer - - no complaints with anything.
my temp controller had a faulty probe, they sent me a whole new unit, with a return shipping label for the bad one, which i thought was nice. My main reason for switching was that they are closer, so basic shipping gets here faster.