It's very effective, BUT... and this is huge - if you miss
a shift or guess the gears wrong, you can literally blow out
your snycros in seconds. With an automatic, it won't
engage if it's too high, but going from 500 rpm to 4500rpm
when it does engage is very very hard on the car - and there
will be a huge amount of engine-braking that hits hard enough
to be a potential handling problem.
Neither one is a good outcome if you mess up. Gas is cheaper
than a clutch, afterall.
