The specs on their site are accurate, but my overall impression was that, while the tripod was sturdier than i expected, the ballhead was flimsier than i expected.

When used with my D70 and 18-200 lens it performs well. there's enough tension to lock it down in any position and be confident it'll stay in position as i tighten the knob. The rotating base is stiffer than i expected, but is just right to prevent the head from spinning freely on its own. When you lock down the rotation, though, it still wobbles a couple degrees each way.

I also tried the head with my medium format (Kiev 60, 30mm Zodiak fisheye) and 4x5 (speed graphic with a 6x12 rollfilm back) cameras. It did an excellent job of holding either camera still as long as you tighten the bolt well. I had to be gentle changing film holders on the speed graphic to keep the camera in place, but it did work at any angle.

The head without plates weighs 14.1oz. The plates weigh 1.2oz and are about 40x50mm, the beveled bottom is 49mm at the widest part.  Both the ballhead and the plates are nearly identical to the comparable Induro model. The plates interchange perfectly, including the locking pin.

The locking pin prevents Acratech and other ArcaSwiss compatible plates with solid edges from working. Luckily the locking pin unscrews easily with a small hex bit. The Acratech camera-specific plate on my D70 fits tightly when the head is locked down.

I've only ever used low-end tripods with built-in heads so I can't truly compare to any comparable products, but for the time being the ATH-A01 will do the job. Since there are no other inexpensive ballheads under 1 pound, i will probably not replace this anytime soon.

See also - AT-A102T tripod teardown