Scubapro octo question

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Nobody should be encouraged on servicing their own regs without proper training or assembling parts starting from a used part estate without good knowledge of the parts you are putting together.
Getting to the point of servicing your own gear is a process not something you wake up in the morning and start doing
I have seen several piece of equipment destroyed by people attempting at improving things that I am skeptical making any observation in that direction without knowing who I am talking to.
In this specific I do not gauge that who started this post knows how to put some parts together and also has no access to service kits or other tools, so I would gear the choice towards something that can be maintained and serviced at a shop close to where our friend lives.
I am not saying you are wrong I am just stressing that you can't go on that path from day one without proper training

I agree that it takes training, knowledge, and a fair bit of mechanical aptitude to keep from rendering a regulator unusable, but servicing regulators is not very difficult. I suspect we do not see eye to eye on the concept of proper training. The manufacturer's course may be no better than adequate reference documentation and a good mentor. The only problem with tools is figuring out what you really need and what just makes the job a little easier. Parts can be a problem unless you pick a brand that supports DIYers, but all have sources if you put in the effort to find them.

DIY is not for everyone. Probably suitable for a small minority of divers. But it ticks me off that a diver who has rebuilt a carburetor or did a brake job is actively prevented by many scuba retailers from servicing their own regulators.