The Rollei 6008 and it's variants do indeed have built in metering but the WLF is not any more standard than with any other medium format camera. It's nice that you still have all the metering functions with the WLF but I haven't seen that really slow the enthusiasm for the 45 degree prism finder. I personally have both (prism and WLF) and I see the 45 degree prism more often than I see the 90 degree prism on Rollei 6008s.
Originally Posted by Dr Croubie
One issue with the WLF in the 6008 is if you truly use it as a WLF and you don't shade the finder with your face ambient light falling on the focusing screen can at times affect readings. Just something for people to keep in mind. It's a really nice system but it is not without its quirks. You can always hold it up to your face for metering and then lock in the metering. Then you can return to waist level to compose.