I guess we'll see how it shakes out. I like DropBox a lot but I'm not adverse to switching if something equally as easy to use comes along. I mean, DropBox has a really good track record with me ... good speed, 100% reliable, nothing ever fucks up. It's magic.
I don't have to do ANYTHING besides save my files in the DropBox folder. It would take that exact same level of simplicity to get me to consider switching to be honest.
As for the price, well $10 a month isn't exactly a back breaker for me. Someone offering me a 75% savings on that isn't really all that compelling.