I have the Crate TX50B. For what it is, it is reasonably loud and sounds reasonably good.
However, I have had extensive trouble with mine. The first one had to be sent back to the factory within about 6 weeks of my owning it, after it just completely died on me. They sent me a new one (which arrived with some cosmetic shipping damage) which developed a horrible amplifier distortion in about the same time frame. I had to take this into NYC for the closest Crate authorized repair shop (I live in central NJ). It took them about 6 weeks to fix it. They said they were having trouble getting the repair parts from Crate.
I do have to commend Crate Customer Service though, every time they were extremely professional, helpful and courteous. The shipping for the first one and all the repairs were covered under warranty.
I have never pushed these at all hard in any way. Also, it wasn't cheap. I believe I paid nearly $400 for it about 6 years ago, but I could be wrong, I don't fully remember. Now, I will only use it for extremely casual things. I would never trust it on a paid gig or for anything serious.
But all in all, given the above, it does work well at the neighborhood backyard party, campground sing-a-long etc.
Cheers,
Dennis