Overdriving electronic ballasts...any long term feedback

[IronChef]

A couple of months ago I picked up the thread on overdriving T-8 bulbs
with a 4-way electronic ballast. I tried it and it works as advertised.
My question is....Has anybody been doing this for a long period of time, and can they give any feedback on the results? :?:

 

[aj2001]

Been overdriving 1 t8 and 1 t12 2x for a few months now, theyre still way over shadowed by the halides, but still brighter than stock.I am curious about though not too concerned w/ long term.
Aj