I haven't heard it, but yes, that's what it is. It's the normal Horn w/ Fostex, and the Heil is added on.
I would bet it sounds great given the impressions posted, and Ed's reputation. For me personally (I owned Horns for 5 years), the problem creeping into the Horns, and especially with the Heil is the price. When Horns were what like $650 new you got so much bang for your buck that you overlooked the sort of DIY appearance and some of the limitations. Now with the Heil you're at $1875. Again I'm sure they sound great, but I personally begin to expect a lot more in the fit and finish department at those prices. I wish him the best though, Ed's proven time and time again he's a good guy.
- Eric