WGS...oh, these speakers.
I've had GREAT luck with WGS speakers, I think I have 5 of them. The Green Beret and the Vet 30 in a 2 x 12" is the only expereience I've had with mixing just WGS speakers together in a cabinet and I can say it's the best combination of speakers for me in an Avatar 2 x 12". Plenty of lows, really solid mids that poke you in the chest (or the back of the pant leg if you're really rocking it out), and the highs are very silky. They can be harsh just like any other cabinet if the amp is harsh, but generally speaking the speakers sort of say "Throw whatever effects on it, we'll make sure it would hurt you. Fuzz? Sure. Wah? Go ahead. Wind it up bro. It'll be sweet." I also have an ET65 and an AlNiCo Weber Blue Dog in my Pro Reverb and it's just offensive how good it sounds. You get the smoothness and low end from the 65 and the grindy AlNiCo chewies from the Blue Dog. It sounds like a mix between an AC-30 and a Blackface Fender. Tell your mom I say what's up.

Great speakers...
...If you get good ones. This is the only downside I've heard about WGS. They sound great if you get good ones. I've heard they are somewhat inconsistant. I've only bought 2 of the same model speaker from them, so I can't make accurate assessments, but I've heard from a few folks making cabinets that the quality control is a bit off. BUT...Their customer service, enthusiasm and support is really refreshing in a world where your cell phone can't make a phone call in your house. I've only had to sell one of my WGS speakers off (A Reaper 30) because it was not my cup of tea. Sounded Great, but it just wasn't as 'happening' in a Deluxe Reverb like the Vet30 was....