Let me begin by saying I've never owned a top of the range tripod which costs over £100 so can't directly compare this tripod with those sort of tripods. If I made a living out of photography or was going to be using a tripod day in, day out in rough terrain then I'd probably invest in one of those high-end models.
For me, this tripod has proved to be good value for money. It's a definite step up from the cheap "budget" tripods that are out there. It's well constructed and feels very sturdy. It's quick to set up and the fluid-damped pan head allows for very smooth panning shots. It's taken the weight of my Nikon D90 & flash gun without any problems. I'd say once it's fully extended, the viewfinder on my camera and camcorder is at an approximate height of 6ft. I'm 5ft 9 so it's more than enough for me. It's mainly all constructed from aluminium but the locking clips on the tripod legs are plastic. However unlike some other reviewers, I don't see this as a problem. They're well made, not flimsy and unless you're the sort of person who applies brute force to the simple action of unlocking/locking the clips, I can't see why they should fall apart. It also comes with it's own carrying case, which has an adjustable shoulder strap. The only minor criticism I have of it, is that it seems to have picked up scuff marks mainly on the tripod legs but these are only noticeable if you look at it close up.
I class myself as an amateur who dabbles in photography. So far I've used this tripod for portraits and once for landscapes. I can see mine lasting for years to come, which isn't bad considering the price. I would say it's heavier than the expensive carbon fibre tripods, so it may not be the right one for you if you're going to be carrying it about over extended periods of time.
For anyone else, who's looking for a quality tripod on a budget, which is only going to be used occasionally, I don't think you'll go wrong with this one.