I think the Triumph probably is a fine seat. However, I have a few personal issues with it:
1) The harness adjusting knobs. I HATE those things. I find them very difficult to use and sticky. My friend, however, LOVES the knobs. She says she thinks they are easier to use than the "tail" that most other companies use. This is a personal choice/preference.
2) The Velcro on the back. Again, this is a personal preference of mine. The cover has a "flap" that comes down. It is velcroed to the rest of the cover. I have had bad luck with that velcro. It always seems to come undone, which I find annoying. Again, this is a personal preference.
3) The Harness. I can't stand the harness on this seat. In my experience, it gets twisted really easily and is not easy to untwist. I don't like it.
4) The height. I'll admit it-- I got spoiled by Britax (MA, DC, WZ, BV). When I was used to only the Roundabout, I wasn't bothered by the fact that the Triumph has a really low back, so kids outgrow it quickly. Then I got used to the Marathon, Wizard, Boulevard, Decathlon, and a few other seats (Radian, etc.), which have high backs, and I started resenting how low the Triumph's back is. Again, this is a personal reaction since I am spoiled.
5) The weight. Because the seat is compact, it feels like it weighs a bloody ton. IT probably doesn't weigh more than a lot of other seats, but its compactness makes it feel really heavy to me.
As you can see, my dislikes of this seat are numerous, but are all personal. Other people (a couple of my friends included) love this seat.