thaxton wrote:i2 and i1 don't differ very much. The version with doser has an important disadvantage - the doser itself. A friend of mine had bought it for home use and very soon some elements of the doser broke into pieces. Bad luck perhaps, however I wouldn't recommend this doser for even medium volumes of coffee.
Actually, although identical from the outside, they differ a great deal internally. It's unfortunate that they are sometimes lumped together when reviews are made.
The I-2 is a conical burr grinder, with the burrs mounted in a plastic threaded holder. In the one I had (and returned) the manufacturing tolerances weren't up to it, so they wobbled around too much for grind consistency.
The I-1 has flat burrs in a brass (?) burr carrier which is reported to be a much better and solid setup. The price is generally higher than for the I-2.
My experience was a couple of years ago, so possibly improvements have been made to the I-2 since, and also to the other often reported problem with the non-doser version's spout cracking up (as mine was).
They are both relatively inexpensive, and you probably shouldn't expect commercial component quality or longevity.