Has anyone used either of these and which one is better for all around performance monitoring (0-60, 1/4 mile, engine dyno) and diagnostics?

Both are around the same price

http://www.ot-2.com/

http://dashboss.com/

Looking to buy one and not sure which is better or works more reliably
Thanks
njg

 

200 dollars for an iphone app? does it come with the phone?

 

I think most of the cost is the component that plugs into the car and sends the signals to your phone.