Well I'll give it a go...... I'll give you my opinions. Just remember that opinions are like busses, there will be another along in a minute. For a proper answer, you're going to need to become unit specific, or at least decide semi closed or closed. There are some things that semis do well, and some things that closed do well.
Quote: (Originally Posted by Halthron)
What's a realistic cost assessment for comsumables and repairs? Naturally, you'll have to replace the lime, batteries and O2 sensors. That's sort of like buying a car and talking about gas, filters and brakes. How often does the transmission or clutch go out in these things and what sort of costs are involved? How do you know when to replace the sensors?
This is an it depends kind of answer. It depends where you are in the world, and which type and make of rebreather you have. Sensors get replaced every 12 to 18 months. Batteries and lime are dependant on rebreather type and how many dives you do. And what type of dives you do - Recreational or techie.
Quote: (Originally Posted by Halthron)
When comparing money saved on gas (trimix) to the cost of other consumables, is there still a net savings?
Yes.
Quote: (Originally Posted by Halthron)
I know it'll probably vary by Rebreather but what sort of weight is needed to make a RB neutral in the water, assuming it isn't already?
As in OC diving, it depends on the suit you wear. I vary between 0 and 1kg in tropical conditions with a 3mm shorty, to 10kg with a dry suit.
Quote: (Originally Posted by Halthron)
At what point is someone "ready" for a Rebreather? I expect that the basic requirements are that you have Nitrox/Adv. Nitrox level knowledge and monitor your equipment during dives. Anything else?
Not much else to add. Get in and do it!
Quote: (Originally Posted by Halthron)
How long does it usually take to qualify for the trimix level of training?
You need to go from zero to hero and back to zero again. Then do your Tmx certs. You must have absolute control of bouyancy and an understanding of the risks with rebreathers and depth. And how to get out of the shit..... But having said that, I was Tmx certified before going on to an Rebreather, and within 6 months I was dark, deep, and dangerous again! And glad to be back on a gas that let me think about problems.
Quote: (Originally Posted by Halthron)
Electronic or manual? Besides the cost difference, should someone new start with the manual controls? Are there any upsides for the new Rebreather diver to starting with electronics?
From my point of view, go electronic. It's a lot lower task loading for a beginner. Other people will disagree completely with this.
Quote: (Originally Posted by Halthron)
I am forgetful, I'm guessing that a "pre-dive checklist" of some sort would be a good idea.
This would be dealt with in your training.
Quote: (Originally Posted by Halthron)
Can these units handle several months to a year of storage well?
Provided you give it a clean first, no problem.
Quote: (Originally Posted by Halthron)
What are some of the conditions that, if present, someone should just forget about using a Rebreather?
They shouldn't be a muppet. You need to think on an Rebreather, not just dive. This is like fat women being allowed to buy tight jeans or wear leggings. The shop assistant should say to them "I'm sorry, but madam has a fat arse, and is not permitted to buy these items for fear of offending public decency". Common sense should stop them doing it, but they still think they look good.....