Pros: works well, not expensive, refillable with an easy homemade mix
Cons: DEET is still better
For a few mosquitos on the lake, or on the 4th of July where there's already some smoke cover, this stuff is great. It will never replace DEET for effectiveness but it gets close enough for most days. And making your own refill is pretty simple. 1/4 of an ounce of citronella essential oil, fill 3/4 of the bottle with aloe vera juice, and add another 1/8 ounce of another essential oil for smell (I prefer cedar).