I guess it is because I read allot more peeps bragging about the others compared to GH. Dont get me wrong I have not had any problems with GH products except down to about 2 weeks to go in other closet and salt buildup is definitlly there and heard others had less salt using other products. I might stay with GH but upgrade to their Flora Nova class instead of the basic stuff but still have atleast 1 more run of nutes before I have to start worrying bout buying more so have about 17 wweks or so to make up my mind hehe