I've tried the Boots one and the Mini-Medula. I HATED the Boots one, it was rubbish. Didn't get any milk out! I bought it when my medula broke, but I soon stopped using the Boots one and got another Medula. It's noisy but very efficient, and you can use it with just batteries (though its more powerful when used with the adapter). Plus it's a bargain at approx £43.