Product review (3 stars): It's OK.  Nice to have 5 burners, but it is pretty crowded in 30"
I'll break this up into sections:

1) 5 burners:
This is a pretty nice feature that we will end up using twice a year (turkey day and xmas).  What I like about the five burner setup was unexpected:  Most nights we only use 1 burner.  I like being able to use the one right in the middle.  It looks nice and orderly on the stove.  Stupid, I know...

We loaded up the cooktop with 5 pans, and while this IS possible, it is pretty crowded up on there.  The pans in the back corners seemed a little close to the wall, but probably still OK.

The front two small burners are the small ones, which makes sense considering they are the closest to the knobs.  Only small pots and pans should go here.  We learned the hard way that you shouldn't put large pans on these burners.  Our furthest left knob has a slight melt spot in it after 3 days of use (the knobs are NOT metal - just have a metal film on them).  This was caused by moving a hot pan from the center burner to the front corner burner just to get it out of the way.

2) Burner flame size
The flame size can get so small that you can't even tell the burner is on.  This is why there is a little red light on the control panel I guess.  One time, after cooking dinner I turned the burner all the way down just to keep the food warm.  It did this excellently, but then I forgot to turn it off.  Two hours later, I saw the little red light and realized my potentially disastrous mistake.

3) Grates
Awesome.  This is my favorite part of this cooktop.  No issues that would be common with the round style grates I used to have.

Yes, the height of the grate vs. flame is strangely high.  This has the effect of making the whole cooking area warmer than the rest of the room.  More of the heat seems to go into the air instead of into the pan as compared to my old cooktop.  I am guessing this was done to get a more even heat distribution on the pan, with the side effect of a lot of heat loss to atmosphere.
I am wondering bad how this effect will be when all 5 burners are cooking away in a few weeks...  Might have to turn the house thermostat down...

I can't agree with other peoples complaints about taking forever to boil water.  The burners are sized larger nowadays than they used to be, so even if some heat escapes, you are still getting adequate heat to your actual cooking.

4) Cleanup
Really easy.  Not much to say about this.

5) Installation
The unit fits into your typical opening for a 30" cooktop.  BUT it is about an inch deeper than my old cooktop which caused me some grief with the shelves below my cooktop.  Had to cut them down a bit.  I wondered about this when I bought it, and couldn't find the dimension of coutertop to bottom of stove anywhere.  It would be nice if I could tell you this here, but I have since forgotten it.  Sorry!  Just be aware that you should investigate this before buying.

The clamps which clamp the stove to the countertop are surprisingly crappy.  It's like the clamp was outsourced to 5 year olds.

6) WOULD I BUY THIS AGAIN?
Probably not.  We have survived all right for the last 30 years with 4 burners.  We bought this over the 500 series because of the 5th burner and because I thought it had nice metal knobs.  In hindsight, the 4 burner model would have been just as good and could have saved us some money.  It looks almost as nice (stupid black plastic knobs though) and the burner spacing would have been better.

<a data-hook="product-link-linked" class="a-link-normal" href="/Bosch-500-Series-NGM5054UC-30in-Gas-Cooktop-with-4-Sealed-Burners-Stainless-Steel/dp/B001G0JYFA/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Bosch 500 Series : NGM5054UC 30in Gas Cooktop with 4 Sealed Burners - Stainless Steel</a>

Final note:  I just found the replacement knobs for the 800 series at the sears parts store for $33 (have to buy them all as a set).  I wonder if they would fit the 500 series; if so, buy the 500 series and those knobs separately.