Two years ago, I auditioned the Double Impacts in my house, with a group of several other AGon members. Our overall impression is that they do sound lively, have a pretty nice tone, bass is great. But, they don’t have a ’refined’ sound. The frequency response doesn’t sound smooth from top to bottom. Then there is the WAF factor, and generally the form factor. They look like you have two refrigerators in the music room. IMO, they are just too big unless your room is very large. And, they have a rather "industrial" look.
As someone mentioned above, the Tekton product specs seem to change over time. So, the set you order today may be different from what I had. IMO, that is a detractor. Also, I watched the site for a while, and often saw "ready to sell" speakers, but never "open box" or "returned demo". I know that I returned a set. Were they then sold as new? I don’t know, but I’m suspicious.
After the demo, I listened to a set of Revel F208s in a store while I was on a business trip. I really liked them, but there is no dealer in Minneapolis. When a used set came available locally, I bought them. They sound great. The top to bottom FR is smoother than the Tektons, but they don’t quite have that same "live" feel of the DIs. They do have a very refined sound, whether you are listening at low or high volume. We like them better, and we get lots of great comments from friends who come by to listen. And, they look the part of expensive speakers, while the Tekton’s don’t.
I run the Revels with an REL R528 sub, and a Primaluna Dialogue HP Integrated. They play plenty loud, and they sound great. My room is fairly large, and they fill the room very well. They were a good step up from my previous speakers, B&W 803N, which I also loved, but they are not in the same league.
The only change I would consider is to move up to the Revel Be line, but it’s not in the budget right now.