Technically spoken, the Quadras weren't a bad line of computers. They came with MacOS 7.0.1 up to 7.5.5., that was the bigger problem. With MacOS 8.1 it runs quite stable, and you have access to a bunch of applications that weren't (and aren't) available for AmigaOS, like Word 5.1, Netscape up to 4.something, Duke Nukem 3D, Tetris Maxx, Photoshop up to 4.x and so on. Of course you could do the same, but much faster with a well equipped Amiga 3000/4000 running Fusion or even Shapeshifter.