Hey @MrSumOne,
I also came over from Hyperspin a long time ago now, how ever I started afresh and without using RocketLauncher so I cant give you any advice there apart from many of the features are already integrated into LaunchBox and BigBox.
I have it setup on my main PC which is what I would call a more modern powerful computer and it fly's on there. I also have it on a arcade cabinet which is a much older.... Much much older, a core 2 duo which it runs fine on but does lag sometimes if I'm using a more demanding theme.
Development is amazing as the creator is coding most days and is fully active in the forums, as for the new features Jason the developer puts out a poll and users can vote on items they would like to see and the top ones get added as soon as possible. There are also a lot of members here that can help out if you want to know anything else or get stuck.