Possible IPB Converter - What do you miss/lose when you converted?

[Nuno]

Hello,

I use IPB and with the way IPB4 is going, I must have all options opened.

My community is about travelling so users post photos like crazy. Gallery and Chat is a very important part of the site.

I'm looking for testimonials from members that converted from IPB regarding traffic, features and member reactions.

What most do you miss/lose when you move?
Regarding moderators, did they like it? Was an easy move?

Thanks