While Func retained all of the great ergonomics of the MS-3, the R2 tweaks the working components a bit for better overall durability and further flexibility through its software. The Func MS-3 R2 now features software upgradeable firmware, a new more precise and durable scroll wheel, and Omron switches rated for 10 million clicks."
A quick patch update to Windows can extend the useful life of a PC. To take the fear out of Upgrading Windows 98 to Windows XP, rely on this guide. - PCSTATS Tips