I just received my reefkeeper elite as part of a package deal from Reef Radiance on Tuesday. Upon opening it I saw it had the wrong instructions booklet. I emailed DA and they emailed me the correct one in just a few minutes. My temp probe was also not calibrated correctly so emailed them again late last night and had a response waiting for me this morning. Of course you hope to not have any problems with new stuff but it happens and I have been very impressed with how DA has responded. Paul