Ads have yet to show up on my Fire 6. I'm not complaining!
The new HD 7 is good, I'm sure. It's faster than the previous HD tablets. I find it noticeably faster. The 6" and 7" are the same in that respect. That speed increase is one reason why, the day these were announced, I put my 2013 Fire HD up for sale.
Now that I have my 6" in hand, love it. Have to get my daughters one for Christmas. One of them was whining just this morning, "You spend all the money on yourself, you have so many readers and tablets....blah, blah.." (Heard that from daddy, no doubt!) I said to her, "What do you want? What do you not have that you need?" Turns out she missed the Kindle Fire that I sold, so I let her know quite clearly I was waiting for a sale.
Of course they can use my 2012 Fire HD running n2a KitKat any time they want. They mainly stick with their Nook HD tablets, though! I hardly saw them use the 2013 Fire HD!
So, sale or no sale, I'll be getting them the new Fire HD. My older daughter (age 11) says the 6" will not be too small, so that's good, we can swap accessories