Hi. I'm also a customer (well.. almost). But I'm a user of a couple of Decos (X60) for ~1 year, so may share my experience and the result of a couple of tests.
When Decos are connected wirelessly in a real apartment (a couple of walls between them) the maximum speed between them was 400-600 mbit/s. Quite the same for Deco's wireless clients (MacBooks, to be more specific). Just to be clear: the wireless connection may have a lot of "moving parts", once I was getting quite a terrible connection just between a deco and a laptop just because the laptop was up for more than 2 months, and a reboot fixed it.
The best result when the laptop is wirelessly connected to deco in my experience is ~700 mbit/s.
I'm not using (and don't plan to use) SmartWifi Pods, so cannot say anything about them.