First off that address its actually .co.uk - not sure if you want to change it, secondly i've just had a glance and i dont actually think they are a member of ABTA which would make me slightly dubious.
Having previously ordered theme park tickets through who i thought to be a reputable company, however NOT ABTA registered; ensuring whoever i book through ABTA registered is now a must.
Two days before my departure, i still hadn't received my disney tickets from themepark-tickets.com (aka sunstyle). I don't know if you have seen a previous post on here but im lead to believe that they have now gone bust. Luckily i got a refund, about a month later mind, but if i hadn't i dont know where we would've stood.
After my past experience i would certainly pay that little bit more by ordering them through travel agents in town.
I'm not sure if you have already booked your trip or you are thinking of going with but i am aware in the back of '08 Virgin Florida brochure they are doing price beating on tickets aslong as they are ordered when you book your holiday. Next time im very tempted to just order them when i book and just keep my eye out for better deals up to my departure.
If it helps, we've previously booked them through through first choice, who also beat prices, and travelcitydirect.com whose prices were really competitive.