Product review (5 stars): Best so far for a Thermador fridge
The first time I bought filters on Amazon I got the Spaceflex Aqua Fresh Green Series, which also claims to be a replacement for the Whirlpool WF285 filter.  It didn't seem to fit my Thermador KBULT3361A02 fridge, and the ice tasted like the filter wasn't working.

This Supco filter works perfectly, and the ice tastes right again.  There are some minor differences between the Supco and the Spaceflex filters, and apparently these differences make the Supco fit my fridge better.