I've been playing this game since last year. It's incredibly accurate. I built the LL0 engine of Saturn's 93 dohc and was off on my hp and torque off by about 2 hp and ftlbs
On that note, while the game it's great as is, it's super obnoxious to try to locate the launcher exe on my hdd, when I comparatively have 105 games on steam that take two clicks of a button to find and use. So while I feel bad for the people claiming steam is not an option, I would arguably say that steam is the best option. I have no doubt that there are thousands of people who would buy this game on steam and haven't yet because the game isn't offered there, two of my own friends included. Plus, the benefit of having extra development time for the game, assuming it is easier to update via steam, is fantastic.
I'm really having a tough time figuring out why steam is not an option for people. Is it because of the inability to download it in a certain region? If you are able to run automation, you should also be capable of running steam from a hardware standpoint.