I would agree with pretty much all guppy's summary apart from the fact that reverse is purly a drag thing.
The garretts can throw serious amounts of air forward. Enough to throw a ground handler on his arse when taking out the prop locks. And when power back they struggle to remain up right. The book figure which is advised for landing which is worked out without reverse thrust can be halved in practise. In fact it has saved my bum with a brake failure in PLY, by the time I had gone for the brakes we were only halfway down the strip down hill and I could have quite happily reversed up the top with a landing restricted load.