I see no reason for regret if you like that tank.
Most kits these days I buy/win, well they aren't set up for my style of vaping, so I try the tank, dislike it and then shove something else on there. Lots of people do it and there is no reason not to. It's not going to make the actual mod perform any better or differently or whatnot. I mean, you can save the tanks and coils for the vacopalypse if needed, but eh, no reason at all not to use the tank you are liking..
I am not a monotank kind of person but there are just plenty of folks that are, etc.
Anna