Retra Pro Max feel good vibe w/o booster?

Not looking to bash on Retra. Basically I am down to purchasing a set of these. I see the booster pack. I realize that is something I should get in due course but due to the rather expensive nature of this purchase, can I use these strobes without the booster. I am shooting a Sony NA-6400 and a Canon NA-R50. Mostly wide angle and mostly with a WWL.

Can anyone tell me how many shots (they get) in (their) normal shooting without the boosters? I realize there can be a range here but most folks do not shoot at full power or need the fastest recycle for every dive and every shot. What can I typically expect?

How do you think these strobes will handle with a Nauticam APS size housings? Are they huge?

Being as I am known to be fastidious and OCD with my belongings, do these have good resell should I decide I have bought a Rolls Royce strobe set to shoot with my Toyota level systems?

Why do I want these instead of the new Atom or HF-1? Simple, the Backscatter strobes do not have a universal TTL mode and the Retra does. I shoot manual but do want TTL capability and the Backscatter strobes do not support TTL with my systems.

Edited 1 hour ago1 hr by Nemrod