Need to clean out the inbox - forgot that it had gotten full again...

Generally, surge protectors have a finite lifespan (the MOV's die a little bit each time they take a hit), so after that many years I'd start to worry about the surge protection being provided by either unit. I'd probably start thinking seriously about replacing them, especially if you know that they've taken some appreciable surges along the way.

As for replacements, I'd feel comfortable with Panamax or Belkin PureAV. I've used both and have had equally good performance from both. Be sure to buy from an authorized dealer in order to get the manufacturer's warranty. I've also seen recommendations for both TrippLite and Brickwall in the past, but have not used either. (Note that Brickwall does not advertise any particular line conditioning capabilities as I recall, but they do approach surge protection in an unusual way - no MOV's, thus no deterioration over time.)