I've put 6000kms on my zondas and they havent dissapointed.
Once speed is up, they roll beautifully and maintaining speed isnt an issue.
They are a very strong wheelset and i've yet to have them trued.
The only problems i guess with the zondas is that they a small bump on the braking surface where the rim is welded together, but i think even eurus has it and in no way does it affect braking performance. They are also a bit on the heavy side.
I think if your going to get the zondas make sure you get the 06 version its a bit lighter and the braking bump is no longer an issue.