@kickysam49 I was recently in just about the same mindset you were. The deals on the old school SWR stuff kept popping up and I was intrigued, as they were the gear I was fawning over many years back when they were the hottest amps on the market and I was just a relatively broke youngster.
When I was shopping for an amp in later years, with some money in my pocket, I did manage to locate used SWRs in a reasonable price bracket (which were more than they are now, but not the crazy high price they were in the late 90s). What I ended up noticing was, they were not as loud for output as some other stuff. The tone was good and there was plenty of function, but the juice seemed to be lacking by comparison to say a GK.
So I bought GK and fell madly in love. But that's me and I know everyone is different.
Currently, I wouldn't hate to try an SWR again. The few times recently I did mess with an SWR, I did notice some struggle with getting sounds I wanted with the more advanced preamps in some of them. In other words, the simplicity of the Workingmans or Bass 350/750 was just fine, but once the 500/900 preamps were in play with a ton of parametric EQ and whatnot, I got a little lost while briefly jamming in the store.
Again, that is my experience. Some others may have found it instantly awesome. I just feel like it takes a bit of dialing to truly get the hang of it and I guess I'm more of a simple pre kind of dude.
I had a Goliath III cab a while back and the sound was stellar and it was built like a tank. The only times I had issues were when I'd let another band use it and they'd fry the horn diaphragm with a distortion pedal. There are 2 lessons there:
1) Never let another band use your stuff;
2) Turn the horn all the way down if you use dirt.
With age and some degree of hard usage, all of the speakers eventually went bad. And it was definitely not worth the cost to fix the cab at that point, as you could find a gently used one for less than 4 speakers or even 4 recone jobs.
Whether or not you want to lug around a 93 lb cabinet is also a personal preference.
Overall, I'd say they were high quality and worth a shot at the right price. But obviously, as some have mentioned, make sure it's in good enough shape and that it's able to be fixed if needed.