I received it early in the afternoon, spent the rest of it dialing everything in and watched Thor: Ragnarok last night. To my surprise, the Horizon actually does seem to perform better than the Sierra 2 I've been using. I wouldn't use words like "night and day", the Sierra 2 made a fine temporary center channel. Plus I'm sure seeing that huge box in its place is coloring my perceptions at least a little bit, but I don't care. It's definitely a big speaker, and one of the beefier center channels I've seen. It's basically exactly the same as my towers with altered box dims and the drivers rearranged to lay on its side. In fact I could see turning the tweet on it and using a pair of these on stands for main speakers!
Anyhoo, so far so good. Sounds great, but I had some user generated issues dialing the subs in yesterday and ended up running Audyssey a couple of times. When I pulled the Mini forward to hook up to my pc I unplugged one of the Hsus and didn't notice until after I did all 8 measurements and took my first sweep with the Umik. I know what my fr looks like in this room and it was way off. So I went through all my cabling, found the issue and started over again. Otherwise I probably would have updated this yesterday. It's frustrating when you get so far, realize you screwed something up and have to start over again.
Later today I'll try to snap some pics and post 'em up. I've been holding off on glamor shots until I got my Horizon and completed my front stage.