Got my new IO yesterday. Was up all night listening to it. First off it's the cutest little amp I've ever laid eyes on. Rega's design is hit or miss with me - well this is a real hit. You don't have to pick it up to know it's heavy... you look at it and you say, 'that amp is heavy'. And it is. Solid. Nice switches, nice volume pot. I bought it for background music in the main part of the house, but of course I had to try it on the big system. First, Proac towers. 90db efficient, sounded great. Also does Proac Tablette 10's and Falcon LS3/5a's in a medium room at a reasonable volume. I have let's say 'several' systems in the house. But if I had nothing I could live with one of these, a decent source and a nice pair of speakers from $400 - $2000. If you want to simplify your life keep this one in mind. Also got the Aria MK3 phono preamp for my headphone setup. I'm running my MoFi Ultradeck into it (which I like more every day) and then I run the output into my Quad tube headphone amp. This setup is heavenly. Listened to all the favorites, Willie Nelson Stardust, Peter Tosh Equal Rights, Norah Jones, Mysterious Film World of Bernard Herrmann - they all sounded amazing. Did I mention it's really nice looking too? It is. So good for Rega. Nice to see them making some killer products.