I have them and will put them up against Big Bores any day. There are a few drawbacks right off the top, but once you get past them, these shocks rock.
1. They come with plastic shock caps out of the box/bag. That means you have to pony up the extra money for aluminum caps to reduce the risk of blowing the caps off on a hard landing.
2. They do not come pre-assembled. At first, I found this to be a pain, but later I was happy that I did have to build them. Having to build them up front made the periodic rebuild that much easier.
3. The stock springs suck. This is common to all aluminum shocks that I have seen so far (with the exception of the Progressive Shocks). By using the stock Traxxas shock retainers along with the Team Associated retainers you can use larger diameter springs. Go for Trinity springs. They are great. The blues work well for mid-weight trucks and the blacks are for the heavy wieght trucks.
I know that these all seem like cons. BUT I am quite happy with my set, and I look at bullet 2 as a plus for my own education (now I know how to tear them down and build them up much more quickly). I view bullet 3 as a common problem as the springs that come on the Big Bores are weaker than the stock T-Maxx springs made by the same company (Traxxas). Bullet 1 pissed me off until I got them home and put together. So a little extra dough, a little extra sweat, and you have a decent set of shocks.