Haven't done the LAS
leg, but I did fly their 738s last month in/out of SLC
. I found their F seats were comfortable. We just had the overhead monitors and no PTVs, but those are around. The PTVs, if they're like the 757s, are the standard free channels (CNN, NBC, Fox etc), some movies etc. There's Gogo on them as well. I was in the window on both legs and it wasn't bad, though on the longer flights I prefer the aisle.
F service will be the typical service with two choices (probably some sort of chicken dish and pasta). The best part of DL
are the Biscoff cookies. Get a few packs from the snack basket and squeeze lime juice on them. They taste really good.