IndigoBlue:Every (both) GUE instructor I have talked to wants you to buy their gear, starting with a backplate, harness, and STA. Every person I have watched go this route has done so. I was not aware that any stores carry rental gear for DIRF for the backplate, wing, harness, or STA.
Most divers already have their own regulators, so the issue becomes buying a long hose as well. Normally you will be talked into a 5 ft hose, and no one will mention that down the road you will need a 7 ft hose as well or instead.
Should you want to proceed beyond DIRF,
...
Technical gear, to nontechnical divers. My view.
Progressing beyond DIRF is going into technical diving. Period.
The poster asked about what gear he needs for DIRF, and you responded with gear you later clarified as needed to go "beyond" DIRF. Then you slammed it all as a marketing ploy to sell technical dive gear to... well, to divers taking technical training
Very diplomatic, but your attempts at concealing your original mistake fall quite short. Going on to say that a GUE instructor told you that DIRF requires double 104s and a drysuit was blatant.