i presume one of the "they" u mention is me... 
ya using v power is a bit rough on TA200 that is what i experience.
however, pick up is faster lah. me got a mech friend who do mention
abt v power too saying that problem with v power will be hard to
start up in the morning but me had no such problem so far.
used the motor up u mention and the effect really gd. however after
2 days the kick start to wear off liao... but then the gear shift
really smoothen a lot... try to pour another 3 caps in but the
effect still the same. so i presume this is the max i can get out
of motor up. frankly speaking, motor up not bad for gear shift
problem. only problem is when gear shifting is too easy, u tends to
shift all the way even without reaching the required speed!!!!
as for motor up for petrol, dont really see the difference...
