Ive had my diy dampers on for 3 weeks now and theyre still stuck in the same position so thats good! I made mine from the article in hi-fi world, cost is about £3 for 4 so worth a try if your so inclined. Its hard to say if they've made a difference Id like to say there is a tighter top-end but this could well be something Im wanting to hear if you know what I mean. Anyway, Ive scanned the article and pasted it to publisher, if anyone wants a copy let me know and I'll send it to you.