The Service Plan has saved me a ton on their junky remotes. The CSR's even told me what to look for in a failing remote so I could order a new before the old one dies. Have gotten many for free because their remotes die, often. Even got two 21.0's as 6.3 replacements that turned out to be just as bad. But it also made the service fee $29, of which they often waived. The $15 is reasonable.
But you need to make sure that it is clearly stated in your account records what devices you own. And you will need to check that they are still listed every so often. Had all mine clearly on my records and then when I upgraded to a 722 they took my 625 that I had the week before checked to make sure was listed as mine, and it was. But when they took mine the CEO Office CRS said there was nothing on my account listed that I owned anything and since they were upgrading me to a 722, of which I paid the fee for so it wasn't free or anything, they would naturally take the previous receiver. I have many receivers that were listed and were missing the day the work order was created, so I was told, so the tech took my 625 and could not return it. After a screaming match with the CEO CSR, he gave his number to call him back, I accused them of outright theft and that I would pursue it as such. He started stuttering and then offered me a $300 credit.
So just make sure you have your gear clearly listed on your account and make them give you proof. Or so I was told for the future.