It’s not released yet (coming out only in a month) but looking forward to trying it out next year
This year I have already been ripped off by VIAC paying almost 1% in FX/transactions costs.
The fund choice you’d be buying with ZKB is very limited however. Here’s basically the main fund of interest you’d be buying to max out stocks - Swisscanto 95 VT - 0.38% TER and ~30% CHF hedged (I’d guess equivalent to around 0.5-0.6% hedging cost)