I do love my SkinnyFATS even though I've had minor issues with them almost every time I've ordered online (although usually another location) from missing sauce, wrong sauce, missing items, food not ready, not finding my store credit, etc.
I don't live in LV, but travel here constantly. That said, to say I was SHOCKED by the whole "downtown Summerlin" thing is an understatement. It's what every suburb dreams of becoming. Rows of Teslas, Mercedes, Porches, nice even sidewalks, well lit, stores galore, movie theater, parallel parking to try your hand at (I'm a pro), and a parking garage to keep your huge truck or SUV out of the "rain". Luckily, SkinnyFATS has 2 to-go parking spots outside so you don't have to trek from the garage.
This location was way busier than the others I've used. Normally I just wait in the line to pickup, but this location had a guy ask me right when I walked in if I was picking up and guided me to not wait in the line. Go straight to the bar area if you're just picking up. He was great, food was ready. My only complaint this time is that my "over easy egg" was completely solid, 100% solid. As usual, I'll be back, but next time putting "ridiculously runny egg" instead of over easy.