Just a quick pilot rescue

Is this helicopter simulator realistic?

I got long time ago a real pdf manual of the Huey, I would like to use with this sim but before to invest money I prefer to get an opinion about someone who flew this sim for real.

I doubt you'll find anyone here who's actually flown a Huey but it seems to be suitably modelled as far as I can tell. It's certainly completely different from the other helos and DCS generally has a good reputation for such things.

And of course DCS has a pretty good controller tuning feature so you can set whatever controller(s) you have to be more in line with how you think it should be.

Other than that, ED often has "free" fortnights where for two weeks you can try almost any of their modules for free. As we approach Christmas I daresay we'll see another pretty soon, I think they do them every 6 months or so.

The 2 week free trial is a constant thing.
You can try every module for free for 2 weeks.
Once you have done the free trial of a module, you can try that module again in 6 months.
So you can do a rolling thing of 2 weeks on module A, 2 weeks on module B, 2 weeks on module C, and so on.