We will always recommend hardware warranties on all the equipment we sell. It make good business sense to have a computer or server warranty problems dealt with buy by the manufacture and get them to come on-site to replace any broken for failed components.
As a Dell reseller we recommend the Dell ProSupport. We had to call on it yesterday for a 6 month old Dell Optiplex 990 DT that refused to start. It was the first issue we have had with the Optiplex 990 DT.
The Dell technician replaced the motherboard and the computer booted normally.
The client was very pleased to have it fix so promptly. This is the sort of outcome we expect from Dell ProSupport.