The Vantec slot protector kit was the final addition to my case modification and ends the over all feel of the 'work in progress' internally. Easy to install and easy to remove they are exactly what you need if you have a good air flow internally and are wanting to upgrade without worrying about damage to ports.
The plastic is solid and very malleable at the same time, which makes them easy to work with. Overall a great product the only problem with them is I have too many spares left over!