HAHA! Havne't we all wanted to do this at least once?!
I have a harder time not having cart rage in Walmart though! Once, I purposely went around an isle just so I could get in front of an a-hole and be in their way. Spend about 15 min staying in front of them and getting in the way. I won't say it actually felt good or anything, I saw it as the only way to show the person what they were doing to others. It didn't seem to help though. After several failed attempts to get by me they rudely said "excuse me!" so I rudely gave them just enough room to get by and then went straight to the checkout and left.
Some people will just never learn no matter how nice or mean you are to them.
I would not recommend using oils in it unless you would be willing to use top quality oils only and dedicate one of the wicks to each oil. You would also need to clean the inside and outside of the atomizer with vinegar or rubbing alcohol every time you change a wick and every once in a while even if you don't. It does seem to work but it's not ideal.
Nice to have places like this around. That said the last few times I stopped in I found the staff to be a little less than friendly or helpful until I got to the checkout which wasn't all the helpful at that point. In their defense they were extremely busy both times and I did find what I needed (on my own which took forever). I'm sure I'll be going back again though.
Compared to what the mall was like when I was younger say 1015 years ago. It's really gone downhill and there isn't even an upstairs store section anymore. I suppose though if you're bored it might be worth browsing. I'd rather go out of my way and drive to a real Mall.