UD, how would you compare the Roland KC combo with Bose PAS? (One tower and one sub)

Isn't recommended position for a PAS system behind the performer? Have you run into any issues with feedback from mic? I see that PAS has four inputs so, it would be a perfect light weight solution. If it is really that much better then I may just wait a few more months and buy the PAS.

I also like the idea of the Mackie and Roland combo that Dnj mentioned, I'll look into that as well.

Thanks