Spendor vs. Von Schweikert?

I'm the very happy owner of a pair of Spendor S100's. I bought them new 15 yrs ago. My system's evolved over the yrs from transistor to all-tube and thru it all the Spendor's always sounded rich and musical, very satisfying to my ears. I think that the tweeters may be showing their age (or maybe it's my ears!;) but I've been contemplating a change. I've read so much about the VR4Jr's, I need to audition them somehow, but thought I'd throw the question out there. Anybody familiar with the sound of both these lines? How do they compare?