There is no problem in giving this service a try, after testing everything i had shared this. Tested on 6 unconfirmed transaction before sharing it and it was working fine - transaction was confirmed
Rebroadcasting won't help tx to get confirmation, you should include transaction on priority list in mining pools like viabtc tx accelerator which is the only one working free btc tx accelerator for me.
Don't make your own assumptions, this site won't help to get confirmation.
At first I would say that normal domain is appreciated. If you have possibility to confirm transactions, any LTD domain must not be a problem for you. I guess if your website does something, it will be rebroadcasting of transaction. It's not so useful to be fair. Don't want to write only negative but please consider, I write because to make everything clear for you to really develop your service if you wish.