Although I haven't bought from this supplier, I know a few members who have. Please visit the supplier's profile page and check out the reviews left by members who bought from this supplier:
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(Just scroll down to the bottom of the page)
Since they are based in Hong Kong, it would be safe to say yes, these iPad tablets are legit. But I would suggest you try asking them more about it clear you mind of any worries. I'll try to email them too for you and get back to you as soon as I receive their reply :)
In case you plan on using them as a dropshipper please take note of the policy below to avoid any confusion:
Tradestead will do its best to protect the interests of credit card and online payment account owners. For credit card and PayPal payments, Tradestead ships to confirmed billing addresses only. Buyers with verifiable credit record, or who have purchased from Tradestead previously can choose other shipping addresses. If Tradestead is unable to verify the shipping address and the buyer has never purchased from Tradestead before, the order may be automatically cancelled after a few working days and the payment will be fully refunded immediately via the original form of payment.
Hope this helps.