Worked great. They even had free lockers for storing our bags in the lounge, you just take the key. I believe that we were in the non-EU lounge.

One word of warning on this ... because we were flying MUC-IST, we were able to get back into the same lounge after clearing immigration into Germany, because we then cleared out of Germany when we returned to MUC airport. But if we would have been flying elsewhere in EU, we would not have been able to return to this lounge after exiting because this lounge is on the non-EU departure side.