If the Spec's say it does 0-60 in 4.5 Seconds and the best one can get in their attempts is 5.5 Seconds does the driving experience really become unsatisfactory, as testing undertaken by very special individuals in their field of expertise are not repeatable by mere mortals.
Enjoying the Ride is surely the Goal.
Yamaha still produce a underhung TA available today, there latest TT is adorned with it. The Company have stuck loyal to the Geometry for a long period of time.
The idea of comparing a Underhung Design using a conventional design arm, in comparison to the alternatives seen in the 'Viv' should produce a interesting to read assessment.
As for What's Best Forum, there are a few contributors on there with a vast experience and any one looking for an alternative viewpoint will not be selling themselves short having a look at the info on offer.