I my case I had a problem ,with switch, they told me to get DHPP and it would cover my problem this is after they knew about my problem.
I did this and it only cost me $29.00 instead of the $99.00 it would have cost me with out DHPP.
I just upgrade something every 18-24 months and keep getting DHPP free. ADded DP510, added ViP622, added ViP211. I'm out of things to add, but I've gor 6 mos. to go.