Regarding the size, the largest is 3 cm and the smallest is 1 cm. The average is about 1.5 cm. Most have a single root about 1 cm long. For reference, these pots have an ID of about 9 cm.
I have potted out hundreds of flasks, and I really don't anticipate much trouble with these, but I suspect the size would be a problem for many. I don't keep statistics, but I would guess that these are in the lower 25 percentile, with respect to size, of the plants I have deflasked.
That said, they are healthy, it is an excellent cross and the price was right. I am quite satisfied with the purchase.
Mike