I bought a pair of Infinity Monitor IIa's when in college in 1975. I didn't find a burning need to "upgrade" until the foam surrounds in the woofers disintegrated in 2003. I then bought a pair of Totem Sttaf's. The Totems are fantastic, but I found myself wanting that deep, deep bass the Monitor IIas produced for some types of music. Since the Infinity's are so big, I didn't know what to do with them, so I had the woofers rebuilt ($100). Their like new again. I alternate between the Sttafs and Monitor IIas. The Sttafs are better, but but the Monitor IIas are still great. I'll probably keep both of them for life, as long as I have the room, although I'm toying with the idea of moving up the Totem line.