Captain,
I bought the Eureka Zeus last Winter (Around January) at Eureka's Tent Outlet - The Zeus 2 - It ws a Class A model at a great price of ~ $95. I used the tent for myself only (well one night with my dog)
I used the tent for 3 nights on the AT in PA and then took it too Alaska where I used it for 6 nights. I then sold it for what I paid for it on E-bay.
I based my Zeus experience on the following tent experiences:
I used a Eureka timberlite for 12 years, used the Eureka Summit for 4 years, as well as a Kelty Windfoil 2 for 4 years, a Jack Wolfskin Soloist for 6 years and an Outbound copy of a Megamid for 2 winters - Oh yeah plus my 12 year old Bivy.
Pro's - Easily set up, freestanding and very light.
Con's - Condensation, condensation, condensation. I should have realized the problem would be pretty bad when the clerk told me that it's useful to have a bandanna in the tent to wipe off any condensation.
The tent was always wet and clammy, even when it was cold and dry out. One very cold night I close down the longitudinal side vents and it was like a steam bath in there. The rear vent just didn't seem to vent well, even when the front door was open a crack.
It rained several nights in Alaska and the tent was always and consistantly godawful wet inside. The tent is just cold, wet and clammy - Especially if you sit up and touch a sidewall.
My last night in Alaska was when I hatched the plan to sell the Zeus ASAP and get a 2-wall tent again. (I am thinking of the SD Hyperlight) I couldn't imagine how wet it would be with 2 people in there
The other problem with the Zeus was that it always had that new tent chemical smell to it even after leaving it standing in the basement for 5 nights (The whole basement stunk) It really seemed to smell worse than my other tents.
I like Eureka products and I like their quality vs. price. However, I am avoiding this whole single wall bit as long as I am on the damp east coast (or Alaska).
Some friends of mine have the Zeus 2 and they took it out west where it performed very,very well in the Grand Canyon - But then again it is extremely dry out there.
Hopefully this helps you with your decision.