I bought the 22mm inserts for the 26mm breast shields to make them more comfortable. The website is easy to use, the postage is relitavley quick and I was happy mostly with the product. I will say however that I think the design could be improved, as the shell inserts to not "snap in" and move about. This decreases the suction and the milk output. Not impressed that I did a one hour power pump at 4am only to collect 20ml. I have found that heating the inserts under the hot tap before inserting into the 26mm shell makes them grip better and you get better suction. Why not just make a 22mm cone, not an insert? Less parts to wash which would be a bonus and less parts to buy.