I've had very good results turning Solid Burn on for known media. With already good media such as genuine MCC 004 and YUDEN 000 T02 it obviously helps get even better results than using just the writing strategy associated with MID in firmware. Don't definately know why but possibly the firmwares writing strategy is 'conservative' to cope with a broad range of quality variation? Whereas Solid Burn will always push to the best of what it finds.
Another very interesting aspect of turning Solid Burn on for known media is when you burn media with "borrowed" MIDs ie fakes. I don't do this a lot but I have experimented a little in the past with cheap crap fakes.
A lot of poor media (fakes) that uses top notch media's MID's such as YUDEN 000 T02 and recently MCC 004 are often so dissimilar from what they report to be to the firmware that using the firmwares wriitng strategy associated with that MID often results in coasters or very poor burns beyond what it might have resulted in if it had used a proper writing strategy suited to it's true brand/nature.
In the case of crap Infosmart discs with a 'borrowed' Taiyo Yuden MID you 'could' do a strategy swap and get a better result using a proper Infosmart writing strategy but I've found that if you turn on Solid Burn for known media it often gets even better results still by ignoring the writing strategy associated with the MID in firmware and learning based on the actual medias true physical properties. Again leading me to an assummption that media writing strategys in firmware are often conservative in nature and open to tweaking which Solid Burn seems capable of achieving.
Then of course it's also useful for same brand of media made by different companies with obvious variations to the norm such as Verbatim media made in India behaving differently to that of CMC or Prodisc made Verbatim. Again, you would need a conservative writing strategy to cope with the variations.