I'm running 98SE and XP here, 98 being my primary system. With the unofficial upgrades from MSFN and a good stripping down with 98Lite, it's very reliable and runs everything I need, including Tor and VPC. The biggest issue is the browser. With Kex, the latest browsers that work reliably are SeaMonkey 2.0.14 and Palemoon 3.6.32. These do have problems rendering some sites, most of which I don't use anyway. If I really need to use such sites, I fire up VPC and use a virtual XP system.