User Generated Content via IFrame - Pros and Cons?

Does anybody have experience with this kind of approach?

[MySpacePimper]

Hi,

I would like to give users of my website the ability to create slideshows (by uploading photos) and put them automatically onto their MySpace profiles.

Thanks to a posting at mashable.com [mashable.com] two days ago I found a nice solution for this.

It almost sounds too good to be true - I can offer this additional slideshow value to my users, and do NOT have to worry about storage space, bandwidth, programming or anything else normally involved when offering this service on my site. Sounds like a big PRO.

So where's the catch?

Where are the CON's?

Does anybody have any experience with such an iFrame solution using a free service like this imageloop slideshow service?

Any comment is welcome as at the moment I have the feeling that I simply overlook some important CON's...

Thanks!