The Rocker dongle is written by one of the most prestigious authors around,
it boasts very high speed unlocking of Motorola phones.
It supports pretty much any model on the market
including models like F3 which other tools cannot unlock.
Rocker dongle also supports many models without testpoint too,
not to mention is very powerful repair features.
It has a good flash file download facility which is free and also a great support forum.
We used to use Smart-Clip and Ultima box light,
but this tools just gets better and better so we now use the rocker dongle in house instead :-)