Having just gotten one of these, thought I'd report for any others who may be interested.

In deference to my back, and for portability, I am replacing my heavy-duty Manfrotto 3251—a rock-solid tripod with excellent features but not terribly portable at 13.6 pounds—with a 3221 at about 5 pounds. I found a display model for under $100 on the auction site. The model has been discontinued but is easy to find used.

I was seeking a tripod I could use for both 4x5 wooden field camera and Mamiya 645, no particularly long lenses, and no plans for challenging weather shooting conditions. My work will be largely location portraiture. Since I want to be able to make standing portraits, maximum height was a consideration; many otherwise fine models came in short.

The legs have three locked positions. Full extension in the most-closed of the three positions raises the mounting plate to 54.5", and another 5 inches of height could be reasonably gained by spreading the legs a bit less on a secure surface. My current, Manfrotto 4047 head adds another 7 inches, and a view camera lens would tend to be an inch or more higher -- certainly adequate for eye-level standing portraits of people who are not height-exhuberant. This model also has a short center column, which can add about 5.5 inches to the height and is quite solid extended. (I have seen photos of the same advertised model with a much longer center column, probably the source of citations of 70" maximum height.)

The legs do not have metal spikes, just rubber feet, which could be an issue for some users. Some sort of spike attachment could probably be made or rigged.

At full leg-extension, torque -- that is, lack of it -- is, in my opinion, excellent for a tripod of this weight, and I expect no problems from it. The extension locks are very secure and tension can be adjusted. (Mine needed a little tightening on the bottom extensions. I looked it up and found that a black plastic piece that locks in the adjustment is just a cover that can be removed, and that an 8mm socket wrench can then be used to—little by little!—adjust and retry the adjustment.)

The tripod is rated to hold about 13 pounds. That appears conservative, though my equipment won’t come close. My venerable 3047 head is weighty and may eventually be replaced with something lighter, but for now it stays.

Given the short center column and the third, wide-spread leg position possible, the camera can make images from a very low angle.

The 3221 is the black model; the 3021 is the same in unpainted aluminum.
Although I haven't field tested the 3221 yet, decades of experience with other tripods, along with a number of excellent reviews, indicate to me that this is a worthy instrument destined for as many years as I can use it.

I hope this may be useful.