Thanks for your interest in iThemes products!
1) Some of our plugins are currently in development to become responsive( we just recently released Builder Responsive
2) LoopBuddy works with themes that are Loop Standard enabled. http://ithemes.com/codex/page/LoopBuddy#The_Loop_Standard. If your theme doesn't support it, it can be modified to do so http://ithemes.com/codex/page/LoopBuddy#Modifying_a_Theme_to_Use_LoopBuddy. Alternatively, you can use LoopBuddy in a widget area.
Here's a link to the full LoopBuddy Codex, you can find other useful information there.
Please let me know if this helps, or if you have any other questions!
Thanks,
Gerroald

