RTG is much nicer than aga for most things. If you spend your time with system friendly stuff a lot its as indespensible as a decent accelerator.When my bppc died I was devestated, not because of the accelerator, but because it meant my grex, ergo rtg/rta was no longer usable.
It is fun tweaking a system using aga and some reasonable results can be achieved, but it really is like chalk and cheese. Dont make the mistake however that an indivision is a substitute (as seems a popular misconception). Nice bit of hardware, but its still pure aga, with all its limitations intact.
