Yes I have tried both the Adidas supernova 9 and the new Solar Glide. I found the AS9 very cushioned but a little too unstable for me at the heel and a little heavy and a bit slow - great for slower and recovery runs. The newer Solar Glides are firmer at the front, felt a little less cushioned especially at the forefoot (which I didn't really like) and a bit more stable slightly faster shoe than the older AS9.
The Reebok Harmony Rd 3, for me , is equally well cushioned at rear more cushion at the forefoot than both, more stable especially at the heel, lighter and far more versatile and faster running shoe, slow to tempo to faster runs. The upper is far more breathable and comfortable too ( no plastic cage :) Great grip on the bottom, and I guess is very durable as only had mine for a couple of weeks. On Reebok website they have had sales and i got 50% off mine :).
It is a touch firmer than the supernova and solar glide at the heel.
Its replaced my saucony triumph iso 3, which was 40 grams heavier for the same size. The more I run in the Reebok the more I like it - the midsole foam really has got good energy return - seems to push you forward for faster transitions. The other nice shoe is the Reebok forever but I like the extra cushion in the harmony. The skechers go run ride 7 is nice too but the Reebok HR3 is a winner. :)
I hope that helps