I mapped my own emanage on my single supra and did quite well me thinks 580 BHP and 500lb + ft @ 1.35 bar on a hks to4r and stock engine. I was a bit nervous at first as it was my first supra engine and was piggybanking a SARD ecu so was unsure if i would have problems.
Piggybanks are not to difficult as u have a base to start from but on a single the ignition maps are totally different so take time.
I have mapped a few of my previous cars (S14a, evo, pulsar etc) and also a few local cars using emanage as no one around brum seems to be dealing with emanage's and there is a quick buck to be made.
Get familiar with the software first and then go mapping as u waste a lot of time looking for icons etc if u dont know where they are.
I have only used the emanage as i am familiar with it and does me for my road cars but would think twice about a standalone ecu as they take more time/experience.