How durable are the transfer tshirts?

[MCI2MCO]

I'm looking to make shirts for an oct. trip, but i don't want to go thru the work if they won't stand up to repeated wash/wears. Our kids wear their disney clothes all the time and I'll just buy the premade ones off Disney or some other site if they'll last. What do you all think? The ones you guys make are soooo much cuter!