If you're happy with it, then that's all that matters. We can suggest change after change, but if you're not happy with what we suggest it's pointless. Pick something and move onto marketing your services.
Nothing at all. It's just people don't usually associate it with the kind of business you're looking to brand. There's nothing wrong with wearing a wetsuit, but if you wore it to go shopping instead of underwater diving, it would look out of place. That's not to say you can't use a serif font, if it suits you and your brand/image you are your own client on this one so go nuts