Cons - hard plastic can bruise the genitals - you have to know what your doing. When someone tries a product and says "fuck this" you might react in a way that alarms them. (Just think of how many people became Cop lovers that started out by taking the "F- the police" slogan literally). It might be the perfect gift (especially cost wise) - but you have have to get the right size and something tells me it might be hard to get an exchange and don't even think of a refund.
Pros - could reuse container (if not just throw it - but come on that's bad for the environment), no mess container, no dick smell on the hands if you have leave right away and there's no water for hand washing, no one would suspect what the bottle was used for - no OMG I left my container where someone might find it. Once you find a right fit, you know exactly what to buy the next time - you can only hope it's something inexpensive, available and the manufacturer doesn't keep changing the size (especially the hole size).
OMG - with all the sex devices on the market, this one probably is the first "no mess container" that I have seen. The hard plastic container kind a looks like it would bruise and scrape the glans and shaft of my penis, but really like the idea of not having to worry if I get a really powerful ejaculation or plentiful load.