Stay far away from them if they haven't been extensively reviewed by the staff at Salehoo and buyers.
By the far off chance they are legitimate, its best to let someone else test the waters as its easy to recover a company credit card charge with no hassle.
Whereas people extremely new to this, could wind up being scammed out of thousands of dollars. They have to be thoroughly checked out first. I admit it is no 100% failsafe since nothing is. But, reasonably people will not do business with something that hasn't already got alot of reviews.