I’ve had several, most recently an ‘11 Cuvee Brut from a library release. They are very solid wines and a great value when it comes to sparking. Truthfully, I’m just waiting for some of the better vintages (19, 20, 22) out there to reload on them.
Ravines (another FLX winery) also does some fantastic sparkling. I particularly like their Brut Rose. They generally don’t seem to do as many library/non-standard offerings as Wiemer though.