I have auditioned the .5, 1.5, older 2.2's and the 2.3's. I must say the the 2.3's were the best and the 2.2's close but different. About the .5's. The drivers in the 1.5 are a rather big upgrade over the .5's. the sound is much more natural than the .5's which sounded congested and somewhat thin in its reproduction of the music. My humble opinion is for the money you would be better off considering a good used pair of B&W 805N (Nautilus)$1400-$1500 or even the B&W NT series. They are open and much more accurate in their reproduction of the music and about as effecient as the Thiel's if not a bit more. With so many more options at the $1400.00 dollar mark and esp. on the used market (alot of good deals if you do your homework and keep checking till you get the right deal) its hard to pay retail for something new. I setteled on a pair of the Classic KEF 104.2's which were very smooth, detailed and effecent (94db). Good luck in your search...