PocketMatrix

So , if your a basic user and don't plan on using BT or WIFI , the a620 will be more then fine. If you do plan on going wireless or want to use memory and maybe a GPS or CAmera or maybe you want BT WIFI and memory all at the same time , go for the 2215. The a620 is faster then the 2215 , but the 2215 is faster then every device ex the a620. So both of them are exstreamly fast.
GL

If I remember, the a620 came with a CF->SD converter, if you wanted to swap between cards. If you plan on using two cards at once, the a620 is not a good choice.