I had both those centers and the 150 does play a tad bit lower but it was only noticeable when A/B comparing, listening to each on its own I never could notice the difference, other than I felt male vocals played a little more naturally through the VP150, is it worth it; Only you can say.

Personally I would look at the VP160 for better bang for ~$100 more than the VP150, providing of course that you have room for something this big.

M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70