Zivkid,
I use the NX props but I havn't tried the Mejzlik so I can't compare the two. What I can tell you is after flying the Menz 22x8s I ordered the NX 22x8 and was disapointed. Then I tried the NX 21x8 and loved it. It seems the NX are a little longer than the Menz and the throttle response on the NX22 was way too slow. They recomended the 21" and were right.

BTW I'm running a Brison 3.2 which is somewhat comparable to your BME 50.

At $22. the NX 21x8 is a good value and if you ding it, it won't set you back like the Mejzlik. Also Airwild has great customer service and ship the same day you order if it's in the A.M.