Fish Box 40Cm Tank?

[Paradise3]

Are they any good? I can get one with the stand for a total of £125 which may seem expensive but I will be dividing it for a few male betta's as I'm hoping to keep some of the nicer males from my successful breeding of my betta's. I'll be keeping some of the nicer females to go with my other 4 to bring the numbers up to a nice big group.
What would you say? Yay or Nay?
If Yay, how many males could I divide it for?

Thanks.

 

[Cazgar]

You could probably get a more conventional rectangular tank for less money, that one is more a cube shape, I'd only have max 3 Bettas in it
I got my 60 litre with stand for £90, & you could probably get 4 Bettas in one that size

 

[Paradise3]

It's just I want to keep a few of the nicer males in a divided tank for a. Showing and b. Breeding. That's another thing, do you know what shows and auctions I can find near me? I'm in Sheffield.