I use point buy 32 points. As the DM I had to implement this rule. We were using 4d6 drop the lowest before. The problem, we use eTools to build the characters, and I noticed on one of the characters that I got a look at the file, the DM screen showed they had rolled 280 times for stats and over 500 times for HP!!
So I had to implement point buy to be fair to the players who only rolled a few tries. I also put together an hp standard (100% at first level, and 3/4 of max at each following level). This made higher powered characters, but was much weaker that what they were "rolling". When I implemented this, I did a calculation to see at what point buy their current characters were... 3 were >50 and 3 were around 44. So, after a few character deaths, and a few forced rerolled characters, they all have 32 point characters with non-random hp.
I hate being a controlling DM, but my players are my kids and their friends who have way too much time to roll characters, but not enough time to read the rules. Ah well. I love sharing a hobby with them though!

So I had to implement point buy to be fair to the players who only rolled a few tries. I also put together an hp standard (100% at first level, and 3/4 of max at each following level). This made higher powered characters, but was much weaker that what they were "rolling". When I implemented this, I did a calculation to see at what point buy their current characters were... 3 were >50 and 3 were around 44. So, after a few character deaths, and a few forced rerolled characters, they all have 32 point characters with non-random hp.
I hate being a controlling DM, but my players are my kids and their friends who have way too much time to roll characters, but not enough time to read the rules. Ah well. I love sharing a hobby with them though!