Atmosphere, Service & ... Drinks ~ just to help break things down.
Atmosphere: Stogies is a curious place - in fact depending on the time of day, it could feel like a different places altogether. If you want to have a drink and / or smoke and lounge (as per the definition of the word) visit Stogies from 1pm to about 6:30 / 7:00. During those times, the place is not crowded at all - and more importantly there is no blaring music assaulting your eardrums as if you were in a club (which the place essentially turns into in the late evenings - sans the dancing). You'll love sitting on Stogies' terras in the summer (especially near and during Formula One weekend) to watch Montreal buzz by.
Service: The service at Stogies - provided mainly by waitresses - is efficient, friendly and often engaging. The ladies readily recognize the regulars on sight, and if you're new they certainly try to make you feel as if you've been to Stogies before.
Drinks: Great selection of spirits, wines, and beers to be had as well as an extensive selection of smokes as well, although these are a little price to factor in for the fact that Stogies on the corner of Crescent Street aka Tourist Central.
There aren't many cigar lounges in downtown Montreal; Stogies does a good job at holding the fort.