I bought this card to replace a Sandisk 32GB Class 2 in my Motorola Milestone 2. The card gives very good results with the test tools sd android. By cons my phone is blocked quickly. After several tests, formatting the card, the factory reset ... nothing has allowed to operate stably my phone with this card. I tried this card on my Archos 5 IT and I have not had this type of blocking for now.
So pay attention to the use you want to make this card it does not seem compatible with Milestone 2.