Down to one bike, Looking to add a 13 argon 18 gallium pro

[skiezo]

So I am down to one rode bike and always had at least 2 to 3. I am looking at a 2013 argon 18 gallium pro. I am finding some good prices on the leftovers on the net.
I have not test ridden any yet but plan on finding a stocking dealer somewhere in the area.
I like the 3D system for the headtube and the commercial reviews sound pretty decent. I would be doing mainly solo or partnered rides in the 40 to 70 mile range.
I would like to see if anyone has any opinions or real world experience with this frame or bike in general. Is it a all out race bike or can it be comfy over the long haul with some tweaking?
My roads are fairly decent and rolling hills with a few nice climbs. The wheels will be HED Belgium C2 Tubulars laces to dt 240 hubs and cont. sprinter GS 22mm tires.
Let me know if there are anything I should know about as far as the ride quality and characteristics any other pro and cons on this frame.

Thanks Brian