MicroSIM adapter has undergone some change. Previously the microSIM kept on falling out and it was pain in the butt trying to insert the adapter with microSIM inside it to the phone. For example my HTC HD2 is designed that way that you have to insert SIM card with its contacts facing down... and then when i try to do it, the microSIM just falls out..(( i have googled and found a better solution at microsim2sim 2010©
Their adapter has a special adhesive layer that keeps my microSIM firm in place. Got it today, works perfect.