After staying in exclusively free, dispersed camping for some time, the $20 felt like a lot, but there are amenities and services, and was worth it- especially in TX where there is little free camping.
I called day of because online reservations can only be made 2 days in advance. The staff person was extremely friendly and helpful and booked me a site immediately over the phone, with a credit card to hold the reservation. I was so pleased to have a spot to call home for the night when I arrived some hours later.
If you’re camping in your car, ask for a tent site with a flat parking area. My site had a slanted parking area, so I parked sideways which ended up working out.
Bathrooms are very clean, and I saw no one in or around them when I used the facilities. My site had a water spigot as well. In the morning, someone came by to give me a day pass in case I needed to come and go. Alas, I had to head on- I wish I could have hiked here! It’s beautiful!
It felt very safe.
No service for ATT. Google got me there just fine, but be sure to put in the address ahead of time so when you lose service you can still get there!