Product review (5 stars): I think these have been improved...
These were much better quality this time around. I had purchased this exact same item in the past and they only lasted about 12 months. Since they are not hard to change out, and they are much less here than other places online, I decided to order them again. This time they seem to be much better quality have much better "spring" to them. Time will tell, but it feels like they will last longer. I have had them for about a month now and they have kept their "springiness" thus far.