Luckily we haven't had any failures or problems with our Teradek, in fact it has been very stable. But it is rather expensive, so it is interesting to see that the French Skating Association has tested a cheaper alternative, Matrox Monarch HD.
https://sites.google.com/site/csnpatinage/csnpa/info-systeme-de-jugement
Coordinator of IJS accountants and technicians in Denmark