I love MFFS as it is. It is good that it is being passed over so it still will be developed, but I am a bit (okay, a lot) concerned about it now also being heavily influenced by Universal Electricity. While it is good to have heavier support for UE, this worry is mostly for technical reason, as all UE-based mods seem to perform very badly on my machine (I dunnae, memory leaks? I'm having frequent Out of Memory issues with any UE mod installed, even if there are only UE mods and no others), to such extent that I had to get rid of them all. No idea why it happens, though.
A lot of people don't like changes, but mostly because something they got used to changes. People don't like adapting to new things, but we always do. Change is good as long as it goes in the right direction. Else we'd be stuck. I myself am looking forward to those changes. Some fresher ideas, perhaps.
Personally I prefer UE power over IC2, as it is... I don't want to sound dull or anything, but it feels more sophisticated to me. Though that does not mean I will stop using IC2. I am owner of a server, and most of my folks are more accustomed to IC2. Having cross-integration of the two systems helps a lot. Besides, if people don't want second energy system... what's the problem? They don't have to use it. After all, it is a feature. Ye don't have to use all the features of every single mod. Ye can stick to the ol' good Energy Units.