Everything works fine and fast; Office 2003 was peak Office (last version before the abominable 'ribbon' that no other windows app ever emulated, which, for such a brilliant idea supposed to revolutionize productivity applications, is a bit strange?); browsers won't update to Manifest V3 so uBlock Origin runs along smoothly; most VST plugins released recently, are compatible with Win7 and those that aren't, usually are bad and bloated.
Just today I upgraded the CPU fan to a new one that required to completely take apart the whole casing (because the fan has a plastic mount that needs to be on the other side of the motherboard); doing this, and putting it all together, took maybe 40 minutes? And everything restarted just perfectly afterwards. I love this machine.
I have a much newer PC running Ubuntu, but it's just not as good — lots of little annoying details; and a bit unstable.