I've been running Realtrax on my basement layout for 5 years now without any problems.
I had to replace the Fastrack (with Realtrax) on one of my portable layouts, after just two years of use... It didn't hold up, see below:
The Realtrax on that portable layout has been working flawlessly after 7 years an still going strong.
FasTack works better with older magnatraction locomotives (Realtrax is non-magnetic). FasTrack also handles frequent assembly and disassembly better. The metal used can rust so be sure not to use (or store) in environments that are not controlled, the humidity will eventually take its toll. I like to use Fastrack on my tree layout, temporary floor, and quick setup layouts. The pins can work loose sometimes and cause a poor connection but that can be addressed with a quick pinch of the needle nose pliers.
Realtrax is my preference for more permanent layouts where you won't constantly be taking the track apart. The connection on the bottom creates good permanent connections that never need the influence of the needle nose pliers one a good connection has been made (check them carefully if you have used track). The track is made of nickel silver which resists corrosion and rust very well. Connecting pieces together is bit of an art but still simple once you get the hang of it. I do prefer how much easier it is to power FasTrak vs the RealTrax lockons. Realtrax does offer rubber feet to prevent sliding on hardwood floors and locking clips to keep track from separating when not screwed down.
