Pros
For those who don't have H1B and waiting to get one, the only good thing is Marlabs can apply H1B for you. For those who has already got H1B, stay away from this company unless you have no other offers.
Cons
1. For those who don't have H1B and waiting to get one: Even though Marlabs said they will sponsor your H1B, but as long as your current status, for example OPT, is still valid and can be extended, they will not apply H1B for you. They will wait till your OPT can't be extended any more and then apply, and if you are unlucky in the H1B Ballot, then BANG, you have to find your own way to work legally till next year. 2. After one year on project once you switch to percentage salary (you get xx% of what client/vendor pays Marlabs), , no benefits at all! You will get no paid time off at all, even for big holidays like Christmas and Thanksgiving. Marlabs said I quote "as long as you are not working, we will not pay you." Also, no health insurance at all, no 401k match. 3. In percentage salary mode, even though maybe your annual salary is, for example, 90k, Marlabs will still pay you a base salary like 60k bi-weekly, and the rest of it, you will get paid as bonus in quarterly. 4. You pay will be super low while you are waiting for next project, and if you switch projects within 6 month, Marlabs will not pay you travel expenses. 5. I can't really say about work load because that's depends on the your project, but if you work overtime, Marlabs will keep your overtime pay and only gives you quarterly.
