I went on pof last year after separating with my husband (I was 39)
There seem to be a LOT of people on there, presumably because it's a free app. I was bombarded by messages within the first week, many just one-liners 'hey wanna chat?' Etc
I was a bit overwhelmed to be honest, and only responded to about 3 out of around 50. Most just didn't look particularly nice, many couldn't string a sentence together. Some clearly just wanted a shag, others obviously sent the same standard message to every woman they could find. Many wanted my mobile number straight away which I didn't want to give out.
Anyway, in the middle of all this was a guy who was polite, funny, didn't mention sex, liked music & films (as I do) and looked nice. He didn't pressure me for my mobile number, we just chatted online and seemed to get on well.
I was very wary about it all, and to be honest if I hadn't met this guy I would have deleted the app quite quickly as it was all a bit much. But I did meet him and a year later we're still together & it's going great.
My advice is to decide what you're looking for and sift out the ones you don't like straight away. Pof is good for volumes, but you do need to reject a lot before you find a goodun.
Good luck!