Hi Aqueel,
Onelye.com has been online since 2003 and seem like a legit manufacturer but because we are not familiar with them it would be difficult to vouch for their safety. If you do proceed to deal with them and buy one of their incubators I suggest paying thru an LC or letter of credit which can also be considered a safe/acceptable payment method.
Yes, my daughter loves to them hatch and watch them too. :) Sometimes she will even play with the chicks (my father-in-law is a game cock breeder) when no one's looking!
Cheers.