As far as I'm concerned, for the v4 platform, there appears to be no proven custom tune software available to the public right now. However, this is not what the majority are looking for. Most do not want to tune their own bikes.
There are some tuners like SLR popping up that appear to be able to custom tune a V4. If you live close to one of the tuners that can actually dyno tune a V4, that is the best option. Canned tunes you download to your bike are hit and miss (outside of factory developed Akra tune, which likely still leaves some power on the table).
My advice would be stick with stock or Akra until you have someone you can take your bike to for a custom dyno tune.
The comments about tuneboy tunes running rich, etc likely comes from the fact that most use tuneboy as a canned tune. They load one of tuneboy's canned tunes on and call it good. They dont go through the effort of installing widebands, logging, and doing actual custom tuning with the tuneboy software, as this is a lot of work, time, and takes some tuning knowledge to get a good result.
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