Often a company will leverage another company's expertise and then add value to the products via software or additional hardware to create essentially a new solution. Some of these relationships are so tight that the companies don't even want you to know they are there. These OEM relationships are fine. Why should a storage software company design its own hardware if a suitable reference platform is available elsewhere?
However, the OEM relationship that does concern me -- and I think should concern users -- is the one where the relationship is really more of a reseller relationship. In this case, the company is merely taking the OEM product and adding virtually no value to it. The primary goal is to increase revenues by theoretically leveraging an installed base.
There is nothing wrong with increasing revenues. My concern is when that OEM product distracts the organization from its core product offering.
For example, I know of a tape manufacturer that tried and tried to get into the online disk storage market. It sold one set of OEM products, but that supplier was bought out from under it. It then came up with a strategy that said the disk didn't matter, it was the storage software that mattered. It then proceeded to get a software-only virtualization solution through an OEM deal, and a backup solution, a replication solution, and an email archiving solution. Those sales didn't go all that well, so the vendor got another OEM disk solution.