Product review (5 stars): This is a great cooktop
I've been wanting gas for many years and the Bosch is everything I hoped it would be.  We had the 30" top installed about a month ago with LP conversion and it has performed beautifully and looks great.  A few things other people have said about it:
The burners are too close together - this is true, especially on the 30", but if I had it to do over I would still buy the Bosch.  We are a family of two, occasionally three and it's no problem.  I love having the big center burner.
The burners are too far from the grates and it doesn't heat fast or hot enough - not by my thinking.  I use my lids and it gets plenty hot quickly.
The stainless surface scratches - maybe it does, but I would never use abrasives or even a Scotch Brite pad on it.  A little spray cleaner to cut grease and hot water should clean it fine.
It has good low heat simmer adjustment - I find that's true.
The grates are heavy  yup, and I love it.  Easy to take out and they have rubber bumpers at the corners.
Installation was a snap.  I disconnected the old electric unit and the gas contractor who ran the new supply line dropped it in and hooked it up at no extra charge.