friday received my SF replacement tailcaps - 1 for U2 and other for e2L - both would hang up on occassion. Took about 3 weeks from my email and phone call. The U2 switch feels a little stiffer and just feels and sounds like higher quality. I gave it the 10 on and off fast trial and so far so good (current switch wont pass 10 straight quick clicks). But we;ll see. I also got a replacement A2 bulb as mine died within the first 15 mins of use. No hassles they sent them right out.