The ELF is an amazing piece of gear. I gigged one steadily for about 6-8 months, running it through everything from a 110 cabinet to an 810 cab. The sound is very useable, with a sort of "tubey" compression with the master gain around noon. Very musical. I wouldn't consider the sound vintage, but versitile. It could suprisingly cop more sounds than one would think.
The DI sounds great, and kills through FOH. It can be mounted on a pedalboard for an in ears system, with an option to power a cab, or throw in a bag or case for a fly rig. It can run a poweramp through the DI or headphone out, and I've even used it as a recording preamp in a studio. Set up a cab at practice and one at home, and you have a 1.6 pound amp to carry back and forth.
They run warmer than most amps, I'm guessing because of their minuscule size, but it's never an issue or of cause of alarm. They are rock solid.
It does what it does well. It's the best piece of gear I've bought in a long time.
Do a search and you can find a long thread about it.
I know nothing about the Other amp you mentioned, so I can't comment on it.
The ELF's 200 watts @ 4ohm is very strong and loud. More than enough on most stages. Ran through a 410, 212, or 810, it will be plenty loud. (An Ampeg SVT is only 300 watts for perspective)