Two Zzippies are never the same mate - a few years back my local shop got a couple of "identical" blanks in; my mate got one and I got the other. Both went to the builder & he got his first, let me have a few chucks and I thought it felt great - lovely crisp but powerful rod. Got mine a few days later and it was a rhubarb-stick - nothing at all like the other, and I ended up getting rid of it pretty quick.
Get a nice one and they're fine, but there's no knowing that unless you can try before you buy.
Gary