I got a 2.5 from sax.co.uk during the week. I had origianlly ordered a 2.75, but when I saw Jules' post about the quarter sizes missing, I asked to be sent a 2.5. Arrived the next day, usual top service from sax.co.uk Legere seem to be a bunch of numpties, whatever the quality of their product.
Anyway, having had a particularly stressful day, I was keen to just have a pleasant and relaxing blow in the evening, so I put the Legere on. My last experience of an old style Legere was that their 'reeds' were absolutely useless for anything other than plant labels. The Signature is just so completely different. The 2.5 turned out to be exactly the right strength on my Brilhart Level Air 9, and it played just like a really good cane reed, from the very first blow. Excellent tone, good dynamic range, and an attack that could be anything from soft and gentle to ferocious. Made altissimo easy. Felt comfortable in the mouth, unlike my last experience with a carbon fibre reed (Fiberreed) which lacerated my lip and left me with blood all over the place.
I only played for about 20 minutes last night, as I was absolutely knackered, but so far initial results are far better than my expectation. I really could see me sticking with this reed as a permanent fixture. I'll continue with it and see how we go, but the signs are good. Very good.