I said I'd write a summary of what I experienced in El Chalten with the new charges - other redditors please add! And correct me if I'm wrong.

I arrived in Chalten on Sunday 20/10 and the charges to enter / hike in Parque Nacional Los Glaciares from El Chalten started from Monday 21/10. The charges have been in place for a while from the Perito Moreno side in El Calafate but apparently this is the first time ever for the El Chalten side.

It's $30,000 ARG pesos per day. If you pay on one day, you can pay half price the 2nd day, $15,000. I don't think you can get discount after the 2nd day, I think you have to pay in full again.

• you can buy online or at the check points
• there are x3 check points where they'll stop you to make sure you've paid: the entrance to Los Lagunas Tres (Fitz Roy)(also the same entrance for Chorrillo Salto), the entrance for Mirador Los Condores and Mirador Aguillas, and ...? What's the third anyone?
• at the check points you can pay with cash or visa (Mastercard doesn't work)
• their card machines are the swipe ones - some card issues block this type of payment method, depending on your bank you can change your settings so it allows swipe payments
• I tried to use the website in El Calafate and it didn't work for me
• We were stopped at the check points so we paid with Visa card at the check point for Mirador Los Condores. They told us for the second day to show the first days ticket and so that we could pay half.
• we never actually did this because there was no one at the check point at 7.15 am when we started Fitz Roy the following day. The wardens said they started at 7am but I presume they were late, they were there in the afternoon when we returned but they didn't check us when we were leaving.
• I think for the 2nd day discount it's meant to be an online purchase, rather than in person tickets - but I couldn't test, the wardens seemed to think in person would be fine too.
• there is no check point or wardens at the start of the Laguna Torre hike
• there's an alternative entrance to the Fitz Roy hike the road below the main entrance with no checkpoint

Main points (from my limited experience) - get there early enough and I think you'll avoid it, although I suspect if you're exiting the trail suspiciously early they might check - if you find a back route to the main route in you'll probably avoid it - Mastercard usually doesn't work - only the big main trails have check points, I think for most "secondary hikes" they won't check

Note - there's no western unions in El Chalten - get your cash before you arrive. Note, the withdrawal limit in El Calafate was $75,000 pesos in the only one I found with money so do small exchanges - I don't have the education on the background to Argentina's economy to make a judgement on whether the new charges are fair

Hope that's a bit helpful! As I said, please comment / add / correct