You will miss all of the tweaking, tube rolling and all of the other BS that goes with tubes.
I just miss the sound qualities. I have never had any attachment to tube rolling or tweaking, though I've certainly participated. I prefer to set it and forget it, but I still come back to tubes for certain qualities of sound. Once I find the tubes that work for me I don't change them. BTW, my SET amps auto bias, are stone-simple and I have have never once had a problem with them in 7 years. When I think of it, contrary to some naysayers of tubes I've never had a single problem with any tube component other than a fuse blowing and or a tube arcing in one amp (which was a new Russian-made tube), both of which were isolated incidents, and easy to diagnose and fix. I'm sure I've owned over a dozen tubed components. To be fair, I've also had pretty good luck with SS components: I did once purchase an older Bedini 25/25 SS amp that turned out to need repairs and was returned to the seller eventually, and I was on the verge of wearing out my first SS amp and preamp (BK EX 140 and Superphon Revelation) as both were exhibiting early signs of problems when I sold both (cheaply) at about 10 years old (full disclosure on the sale, of course). Perhaps I'm just lucky - in 25 years I can think of no gross unexpected failures, or maintenance issues that were headaches in that time and with so many components. I'd consider myself a pretty average technically competent individual when it comes to dealing with such technical issues. Oh, no wait a minute, I just thought of an exception. Vinyl!! As much as I love the sound of vinyl I DID find that aspect of this hobby to be a royal PITA as far as tweaking and maintenance. It is just because I prefer to set it and forget it that I eventually (about 14 years in) gave up vinyl altogether and sold my entire record collection. It was not for any failure, but I couldn't stand the amount of maintenance and tweaking it took. I'd much rather spend that time listening to music!