I've heard nothing but good things about Amiga Explorer but have never used it so can't comment.
I have however tried Amiga Forever and certainly wouldn't pay money for it, not when much better, free solutions exist such as ClassicWB.
Anyone who is looking at getting in to amiga emulation should skip over getting Amiga Forever, grab a kickstart rom from somewhere (maybe an awesome boot sale) and test out ClassicWB (or something like AmiKit for a more 'uptodate' setup).