Here's my similar experience. I too have had a VII tenor for a long, long time (since around 1979). It did everything I needed it to do. However, about five years ago or so, I played some VI's and realized that there was just something lacking with my horn. I then went on a VI quest and played well over a dozen of them over the course of a few months. Then I had the opportunity to try a vintage Conn tenor and my quest took an immediate detour to a 10M; which I soon bought. I kept the VII though, as a back-up, but rarely played it over the next few years. Trying out a vintage King tenor (and owning a Zephyr alto), I got the itch for a Super 20 tenor to use more for rock and roll gigs, leaving my 10M for jazz, and less rowdy jobs (it is rather vintage and pristine). Before taking the plunge however, I took out my VII, made sure it was in good working order, and gave it some time. Having gotten so used to the 10M, I really hated playing the VII now. There was nothing about it I liked, and the once friendly ergos for my somewhat large hands seemed ridiculous. Why have a back-up horn I'm never going to have any other use for, I wondered. So I took an Ebay gamble on an undervalued Silversonic, figuring I could flip it if I wasn't happy with it (and it wasn't a complete mess). Once it came and I had a chance to evaluate it, off went the VII. With no regrets.
It's okay to make a change; but just make sure that change is warranted by your own experiences and not the accounts of others.