I used to love watching the tubes..Until on more than one occasion, one would glow cherry red and quit! It got to the point I was staring at the tubes to make sure they were "behaving" normally and subconsciously worried while not paying attention to the music!
Now, I run SS amps and let the tubes in the pre amp do their thing without having to stare at any tubes!!
Seriously, I love tube amps and surely will own more again!
If you plan on keeping your Maggies..be sure to use LOTS of good tubes! ;-)