About vastika ,
Payment is on time ( make sure you verify your hours for which you got paid)
run by nepali
provides accommodation during training time if needed.

But,
they will try to put you on the class they have started training for , not on what you planning to go for. ( will try to convince saying that they will land you in job within a month or so, which is a lie)
Marketing is not done for all equivalently, they try to focus more on the people using their accommodation ( don't have to be genius to figure out why) and people they prefer.
Raise is joke. You wont get it easy, if you get it , its probably in cents.
During marketing, you can reach greg directly. When its time to talk about raise or paper processing, you will probably end up in voicemail .
There is no support at all after you land in a job.

If you need employer to file GC as well, vastika is definitely not a good option.