I recently purchased a Kobe wall mount hood that uses a 6" duct. I will be installing it this week sometime, but we don't move into the new house for another week yet...so i won't really be able to give it a thorough test for a while. When the hood arrived, I opened it up and temporarily hooked it up to see how well it works. I had some duct work connected to it to see how loud it was going to be once installed. I was very impressed with the construction and performance of this unit. I'm sure I will be just as pleased when it's installed too. Here is a link that might be useful: My Kobe hood

Between the two you've cited, at first glance, I preferred the one on eBay, solely because it has baffle filters. It is unusual to see glass hoods with baffle filters; most glass hoods have mesh filters. I prefer baffle filters because mesh filters clog quickly--sometimes with even one session of hamburgers-- and if you don't clean mesh filters often, their efficiency is compromised. But on second glance, I see that both the eBay hood and the Overstock hood are only 20" deep - that is too narrow and won't cover your front burners. Your hood should at least 24" deep. What would be the point of going to the expense of a hood, plus the additional 6" width over your 36" cooktop, if your hood won't cover the front burners? Both hoods are 860 cfm, yet both only require a 6" duct. That's good if your home has a 6" duct and you cannot install a wider diameter duct. But typically a hood with more than 600 cfms requires an 8" duct. That's because you will get a very noisy hood as all those cfms are pushing through a duct that is only 6". The duct for 860 cfm hood should be 8", or, no matter what, the two hoods you are looking at will be noisy. If you have a 6" duct that you cannot change, and you don't mind the noise, there are other hoods out there to buy that would be more than 20" deep. The other factor is how you feel about glass. It will show every splatter. Some people don't find this to be a problem; it is a kitchen after all. Others are bothered by the splatters on the glass, and have to clean it after every single use. You know which type you would be. Also, dust will settle on the glass top and be visible. Dust would settle on a stainless hood too, but won't show instantly. This is a personal preference thing, but keep it in mind. Jane's linked Overstock hood Jane's linked eBay hood

Hoods that try to mimic actual commercial hoods while retaining a more modest size, practical aspect, and decent aesthetics are widely available from many sources that can be found on the Internet. For example, you can download the Wolf Design Guide and look at the pro island hoods to get an idea. There are others fabricating similar designs. While this is a necessary exercise, the first step is characterizing the parameters of the hood, blower, and make-up air system. To do this, it is necessary to start with the size of the cooktop. If you have already done all the math and know your necessary hood size, then a tour of hood makers' wares is next. Please keep in mind that of performance, aesthetics, and affordability, generally only two out of three can be maximized. Most hoods are compromises within these factors.

Please review the many range hood threads on this forum to gain insight, around which we can advise. Some messages will include links worth following.