For HughesNet, performance will depend on how full the beam that covers your brothers area. Gen 5 plans are all rated for 25 x 3, and you pay based on how much data you think you’ll use. If he goes over the allotment, he won’t get charged extra, his speeds are just slowed down unless ‘tokens’ are purchased. All HughesNet plans include 50 GB of data inbetween 2am and 8am that doesn’t count toward the bucket. People have come up with creative ways to download content in the middle of the night for later viewing.
My example won’t provide you much useful information as I am far away from Cooperstown, in between Buffalo and Rochester, and there is no chance I am on the same beam, and it wouldn’t matter anyway since I’m on Gen 4 (EchoStar XVII) and all new installs are Gen 5 (EchoStar XIX). But on the 15 x 1 plan during primetime I am lucky to see 2 or 3 megs down and an upload speed that barely registers. Latency is in between 600 and 900 ms no matter the time of day, which is actually quite good for satellite. The beam I am on covers three Indian Reservations, which have no other options, and a good chunk of the rural southern tier. So I imagine it's packed. Viasat actually quit selling their service in my area due to capacity issues.
If pricing is a concern, HughesNet is not your friend. Gen 5 starts out at $60 for 10 GB per month, 20 GB is $70 per month and there is the $15 per month modem rental fee if you opt not to pay the $400+ for the hardware.
It works okay with low rez YouTube, I never had the patience to see about Netflix. This is only my backup internet connection, so I don’t use it often, but when I play around on satellite it’s painfully obvious. Anything that is latency sensitive like VOIP or remote desktop services will not work well, if they even work at all. Also if smart speakers are ever purchased expect to wait forever for responses from Google Assistant, Cortana or Alexa.
Be aware of T-Mobiles maps. They have me as ‘Fair’ as well, but I cannot get a signal until I drive about a mile north of where I live.