(Sorry- I know this thread is old)
I had them as my main speakers all the way until I was wrongfully convinced to "upgrade" to Advent Laureates. The 40's had decent bass, the cone tweeters begged to upgraded to domes, and they kept me happy. Noticeably better speakers were my friend's T-120's, which put out lower bass and generally sounded BETTER.
I know I'm going to hear it from Advent Fans, but hear me out- a friend wanted my pair of 40's and convinced me to "trade up" to the Advents, which looked nice and on paper had better specs, but compared to the 40's, they were bass-light. Oh well.
If you have a pair of the 40s and got a better crossover and a nice dome tweeter, they'd probably sound decent.