Trouble with Parallels

While good, Parallels Desktop for Mac isn't perfect. It runs well in window mode but seems to take some pretty significant performance hits when running in Coherence mode. Additionally the support for multiple displays is spotty: there is no support for running independent displays; you can only run in extended desktop, which isn't ideal unless you like manually resizing windows. Still it is the best product if you must run Windows at the same time as your Mac OS.