My hide was tempered on Usenet back in the olden days.
This month I've prepped several Debian servers for shipment to Florida and Michigan. RAID, terminal servers, SAMBA, ftp, ssh, bar code printers, tape drives, etc. - mostly upgrades replacing SCO Open Server boxes. Some I built, others are Dells.
The accounting VAR I configure for knows they go in without a hitch and he's sending me a couple more Dells next week - but this time I have to figure out how to make a USB flash driver work - I hope that's not "an interesting problem".
Fortunately I don't have to worry about "in place upgrades" - these machines won't be touched for 5 to 10 years - baring hardware failures.