It's a nice option if you want the package to be able to add free dining or pay for the dining plan, however, it still seems to work out a fair bit cheaper to book a 10 day MYW ticket through Undercover Tourist. I haven't even looked to see who else sells them and compare price es but a very rough calculation at an approximate exchange rate of $1.60 to £1 puts a 10 day hopper at £241 and a non hopper at £218. I know it does not include waterparks and DQ so that would be a consideration too.
So yes, if you are doing 10 days and want free dining then it's great. But if you are just buying tickets it looks like you can do better.