Get used to it, if you wish. I currently have in my home the following centers: NHT M5 and an Infinity Intermezzo C5: neither of these show the off-axis tonal variation, and on axis lack of timbre match that the VP150 did compared to the M2s. The middy sound you're talking about is exactly what I noticed and it was much worse off-axis. Now if I read Alan correctly, he's saying that with voice or music you won't notice the difference. I suppose you could make that argument for a $100 center. But if I'm spending $350 on a center, I want a much better tonal match to my left and rights than the VP150 provided as well as better off-axis response. As I have stated before, I would love to see some NRC measurements of the 150, both on and off-axis out to 30 degrees to see if what I (and Misfit) hears can be measured.
