for the guy who started this it depends how deep you want to get in to logging.
i my self got a wego3 for hacking and tuning my zx12 ninja. well it goes on all my toys and some friends.
it is just rpm afr and a 0 to 5 scalable channel.
but you get to see many things no one that is not logging can see with just afr and rpms.
the size of a credit card.and 300 to 400 bucks.
.1sec is the fastest poleing setting and 800 memory cells. so at .1 you get 1 to 2 passes in the memory.
but i love it with out being a lot to look at it is simple for simple logging.