I went with the daily shuttle which leaves Copán at 2pm and leaves the hot springs at 6:30pm. The shuttle was good and comfortable. Took just under an hour each way, but it was nice to look at the surroundings on the way. We received a detailed tour of the hot springs and were told the temperatures of the water and which ones are too hot to touch. The tour was in Spanish but I think they also speak some English, and as long as you know "no tocar" then that's the most important!
Overall was very nice, in particular I enjoyed the set of cascading pools that went from warm at the bottom to hot at the top. It's nice going from the hottest one at the top to the nearby cold (ish) pool. Some of them like the one they called the jacuzzi I think were too hot and I didn't go in. Overall a nice experience and I think worth the money.
I probably wouldn't come just for the hot springs, but if you're already in the area to see the Copán ruins then it's a nice way to spend the afternoon.