OWC vs TransIntl (RAM/Heatsink)

I bought a 2008 MacPro and am about to buy some extra RAM to go with it. I checked out both OWC and TransIntl. For 8GB (2GBx4) the price is practically the same ($1 diff). However I noticed that the Trans heat sinks seem to be spitting images of the Apple ones, but OWC's look very different. Looking at the OWC, they don't seem like they would be very good at dissipating the heat, they look pretty flimsy to me. Has anyone had any issues with the OWC RAM running to hot, or does the sink do enough of a job despite appearances?

Anyone have any personal experiences causing them to lean one way or another?