I have a 45l and wish I sprung the extra £100 for a 60l. I can just do 2 cornys with the 45l by sparging the grain with fresh water in buckets and then topping up the kettle in the boil phase. Works well but the extra capacity would have been nice.
I would say the more you drink the greater...
Just brewed my first loosely based on Clawhammer one. It is bloody lovely but also quite expensive comparable to other brews. Glad I've done it and am enjoying it but I won't be rushing to brew it again.