Pros
You know, I wish I could tell you. They seem to do Localization work for some small companies and they have maybe one or two accounts with big firms like Apple, where they send out contractors to do similar work for them. They have changed hands so many times where management is concerned, that it's impossible to get a comprehensive understanding as to who they are or what they really do.
Cons
Do not, I warn you, do NOT agree to work for them as a contractor! I consider myself very unlucky, in that I work through them for Apple and find myself in some sort unsavory arrangement between the two of them to be kept as a 'Permatemp.' Surely everyone has heard that term by now? I have been with Apple for three years with no benefits, and though Welocalize makes a mint off me for my efforts, Apple simply writes that off as a tax deduction. So everyone wins! Oh yeah, except me of course. I want to remind everyone involved that Microsoft was sued $100 million by its Permatemps, and unless Apple and the sleazy agencies it works with want a similar action to take place, I would really suggest they start cleaning their act up a tad. As for myself, I think some folk at non-profits make more than I do, so it's not as though I would be terribly put out if they were to let me go. Oh yeah, I almost forgot to mention the most important part, that they now owe me 2 week's pay. I haven't heard a peep out of them, so I guess their contractors are expected to work for free now. Welocalize, you're the best!