Early on in my playing, I lusted after the SWR stuff, particularly the SM900. At the time, it was the coolest looking head out there and super primo on the pricing. I actually bought a Workingman's 10 combo 22 years ago that I still have and it works very well to this day and a Goliath III cab was part of my rig for some time.
So for years, I actually hoped I'd get one of their better heads some day, particularly this one.
When a time actually came that I could afford one of the SM900 heads (it was used and I was gainfully employed), I sat down to play it, with the hopes of completing a rig that I dreamed of at 16 years old.
- I couldn't dial in a sound I liked to save my life
- Output was very quiet, compared to almost every other amp I tried at the time.
I'm definitely not saying it was a bad amp by any means. It was well built and feature packed. But it really clued me into the fact that some amps just aren't for everyone.
In fact, I'd say over the years, what I truly desire in an amp is simplicity and volume. The WM10 combo was very simple and loud enough for small gigs. And my go-to brand for amps now is GK, which by comparison to the SM900, has a very simple preamp setup. It also has very loud output.
Essentially, the SM900 just wasn't for the bassist I became later on. And that's okay! I didn't have to learn it the hard way by buying one when I was younger, they were new and crazy expensive, then losing my arse when I sold it at a loss for not being what I truly needed.