I have a year round navy blazer from J.Press. While the fit and aesthetic of the blazer is quite nice, the construction could be a lot better.
If you can afford it, I would look into having a special order / MTM blazer done by Samuelsohn. I bought a fully canvassed Sammy "Greenwich" model sportcoat recently that blows away any jacket Brooks or Press could offer with the possible exception of an MTM jacket done by Martin Greenfield. The Greenwich is a darted 2 button model with very soft shoulders and light shoulder padding.
Apparently Samuelsohn is flexible enough that they can make an undarted 3/2 roll "sack" style jacket as a variation on this model. Other than having a bespoke blazer done by Field's, that would be my ideal blazer at the moment.
As far as the basic OLC $350 blazer goes, I think at would be hard to assess whether or not it is a "beater" unless you had it in hand. In any case, like I said before, OLC has tons of stuff not offerred on their website.
Call and ask for Ethan and tell him what you want and your price range. I know they carry Samuelsohn suits and jackets and would assume they can do special orders as well. If a Sammy is outside your budget range, I would ask if they have any old stock fully canvassed, 3/8 lined blazers made by Oritsky in your size (hint: Oritsky jackets run small, confirm measurements against a well fitting jacket and size up if need be). I was very impressed with an Oritsky made suit that I received from them recently.