Some time ago translations for Goemon and Woody Poco were released. Goemon - being MSX Translations' first release - didn't feature a Turbo mode. But now that feature has been added. Woody Poco had a minor bug in it. Saving to PAC in R800 mode appears to cause data corruption as BiFi pointed out (FM-PACs don't suffer from this flaw). This has now been addressed so you don't need to manually switch back to Z80 mode in Woody Poco. So if you want to experience Goemon in R800 mode or happen to have a PAC, you might want to check this out.
Relevant link: MSX Translations