Yeah, perhaps I should have mentioned that this was about brake bleeding
I do happily bleed brakes with tubes and bottles etc but thats only because I've never used one of these new fangled brake bleeders before. On top of that I do like buying tools
90% of the time using tubes is fine but every now and then you get a dry brake line thats a pain in the backside to get started. Once its flowing through properly then no problem. I find this happens more often with the back brake perhaps due to its layout.