I have the green Bosch and it just comes in so handy for those awkward cutting and sanding jobs. It does vibrate, no arguing with that, and it is certainly noisy enough to warrant ear muffs. I paid about £70, but have seen the blue Bosch ones on offer for only about £20 more. If I was a trade user I would definitely go for one of the Fein packages - the one I was considering buying had blades, sanding fingers, dust extraction etc for not much more that the cost of the unit alone. I have no doubt a Fein would outlast my Bosch several times over, plus the keyless tool change is nice to have.
Overall I would say, get one, they are really handy. If you anticipate only occasional use then get a blue Bosch for about £90 - £100. If you anticipate really using it in anger then get a Fein. But definitely get one.
Just one point - they don't sand as well as a delta sander ( so I'm told - no experience of delta sanders) because of the way the head moves, oscillating instead of orbiting. Also if you do use it for sanding, keep the speed down to mid way else you can melt the plastic sanding plate. I melted mine and I found Axminster sell Fein plates cheaper than Bosch ones.
Finally, the green Bosch kit box is about as cr@ppy as they come.
K