I have a Polo 8 2band, its very nice.
I would not however buy any Simpson site unseen as there is to much variation of knot from brush to brush at least with the Duke 3 and Chubby 2 I had in best.
By variation I mean Some dense some not, loft heights all over the place, etc.
I doubt I'll get another Simpson but if I did it would be a Chubby 2 or 3 2band.
I have not had a desire for another brush though in almost 1 year