Does Mixing 802.11n with .11g Devices Slow the Whole Network?

Hi all,
I'm considering buying the new Airport Extreme as I also have a new Macbook Pro that supports 802.11n. I also have a couple Airport Expresses on my network, and my question is this:
Will the presence of the Airport Express units (which are 802.11g) drag the whole network into .11g speeds? I ask this because of this note on the Airport Extreme page:
Speed and range will be less if an 802.11a/b/g product joins the network.
Thanks for any guidance.

I did this the same way....
I connected my cable modem directly to the WAN port of my new 802.11n AirPort Extreme Base Station. I have selected 'n' only (5GHz). I call this network Saturn.
There are 3 ethernet ports on this new base station. Wired to one of these ports is my 802.11g Snow Airport Extreme Base Station. This base station will handle any 'g' services (like my friends who are using MacBooks/iBooks/PCs). I have 2 AirPort Express base stations that I use to play music on remote speakers, and wireless printing. It also has 2 Linksys wireless USB 'b' devices that connect to it, which 2 of my TiVos use to get their daily updates. I wanted to keep all of this stuff off the 'n' network since I heard it would slow it down. I call this 'g' network Zodiak. I can see both networks in my AirPort menu, and can select either.
In addition, I have an xBox that I connected directly to one of the wired ethernet ports on the 'n' base station, and I have a Linksys switch that is wired to the 'g' base station.
My only complaint is that I can't get to all of this stuff that is on the 'g' network. Which means, if I want to print something, I need to change my network, if I want to play iTunes out of my stereo speakers, I need to change the network, and if I want to use my TiVo to display photos, I need to change networks. I was hoping I'd still be able to get to that stuff since the 'g' network is hard wired into the ethernet port of the 'n' network. Oh well. I'm only on a 6MB Comcast service, so perhaps I'll try mixing the 'g' network in and seeing how bad it affects performance.
I'm getting 2.5 mb/sec on a hard drive transfer...can't imagine that being much worse on 'g'.

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