Does your "friend" own a dive shop? Ordering an RB for a diver who does not seem ready for it is not a good friend. RB technology is changing rapidly and each different unit has its plus and minuses- choosing the correct rebreather for the type of diving you plan on doing is a process that takes time. Discussing the options with an experienced rebreather instructor and diver is required. Rebreathers need more maintenance and care than OC gear and the skills needed to dive them need to be practiced on a regular basis. There are numerous seals, electronics and sensors on a rebreather that need much more care than OC and the conditions you describe are definitely not ideal. I would find a local rebreather instructor in the area and start asking questions and I would cancel the order until you are sure this is a step you want to take in your diving.