Pros
Qualitest is a language specialist vendor for Google, thus SLS guys are placed at the Google office, which comes with cool perks and provides good workplace environment. Unfortunately none of this is thanks to the Qualitest and sadly is the ONLY positive aspect of being an SLS.
Cons
This could be a long one, but basically it’s the most greedy and dishonest company I’ve ever dealt with. After leaving the company I’ve kept in touch with some former colleagues and frankly I can’t name one who would be enthusiastic about working for them. While the job is easy, it does require significant effort and provides great benefit to Google, but none of this is compensated adequately. There is no growth opportunity whatsoever and career advancement could be achieved only through office politics.