I work sales and put this on my desk to add visibility to passersby as to what I do. You have 3 lines to work with and really is plenty if you come up with something quick, simple, and clever.
I use one of those portable phone chargers as a power source as I don't want to keep buying batteries. I charge it up when I go home at night.
Included are 2 of each letter. This is a huge limitation. I am so surprised they don't have a paper in it advertising a webpage URL to buy more letter sets online. I bought a second box just for more letters and am considering another.
They sell a letter pack expansion at some stores, but oddly the font is different than what comes in these boxes. They are cute, but you won't be able to use letters from both sets simultaneously, as it would look weird. But the expansion set is $10, has 6 sets of letters with 4 of them black. Might get 2 of them and just use those exclusively as having red letters might be cool.
Weird frustrating quirk is the absence of question marks (?). I ended up erasing a snowman using 100% acetone nail polish remover, and drawing a question mark with thick sharpie.
Another frustration is managing the storage of letters. I put them all in order, put them in a ziplock bag, and wrapped them with a rubber band. I wish there was a slot in the back panel for them like the charger cable.
Summary: I really like this, it has easily paid for itself and its twin. I wish buying letter tiles was easier to expand on, and wish we had blanks to customize. It is very bright. Would recommend.