I didn't pick the T1, but ended up with the Longhunter Guide. I picked Kifaru over MR for several reasons:
1. I am 6'5" and the Nice Frame doesn't lift the same way that the 26" stays on the EMR/Longhunter Duplex frame do. When I tried on the NICE frame it just wasn't comfortable for that reason. For tall guys the extra load lift provided is great.
2. I sweat a lot, and the Kifaru breathes much better because the contact points on the back all have air flow that runs through. MR has thick padding all the way up the back and my whole back would be soaked by the time I was done hiking.
3. The EMR frame has the ability to essentially become the same hauling rig as the Crew Cab with the cargo panel, and even more versatility.
4. MR doesn't match the curvature of my back, based on the measurements I gave Kifaru, straight out of the box this thing fit me perfectly. I have gotten some heavy loads in it up the mountain and I am very satisfied.
If I have all of my information correct, the suspension on the Timberline is the same as that of the Longhunter, but the longhunter bag can be removed from the frame. So most of what I posted above applies.
To muddy the water a bit though, I never fell in love with any of the top lids that Kifaru offered. So I got the MR Daypack lid, and really like it so far. It fits really pretty well, and I was able to do it with buckles that I had here.