I’m sure Ben will be along soon with some proper advice, but a few observations.
First, as with many things, I’d be wary of comments from people who have never tried one.
I spent a few years with a recumbent (bike then trike) as my only bike. In fact, Ben sold me my first one. They have various advantages and disadvantages, but honestly safety was never a factor. You can’t see over cars as well, that’s true, but you can’t see over cars in a sports car either, but that doesn’t make them unsafe.
As with any type of bike there are lots of flavours. Some better in one area, some better in others. With bikes of any sort it’s always a compromise.
In general I’d say that downhill and on the flat they are huge fun. Some can also make great tourers. I did a leisurely (three week) bimble from John O’Groats down to Lands End and it was great for just mooching along admiring the view. I also hit 50 mph going down a hill in Cornwall, which was fun.
What put me off in the end was the inability to stand on the climbs. It’s not that they can’t climb (as is often claimed). If you take the time to develop the muscles and technique you can get them uphill pretty quickly. But it is always a case of sit down and spin, which I found a bit tedious after a while.
Still think everybody should try one at some point though.
Cheers,
Andy