Which LMS do you use and why?

We have used the same LMS for 14 plus years.  It is now owned by SumTotal and is no longer sold. The product is Pathlore.  We have the ability to customize as needed.  We use it both for our employees and our customer continuing education classes.  It has a few little things that bug us but overall we are very happy.  We have currently opted to not switch over to the SumTotal product as of yet.  It does not offer the same rich features as Pathlore and we just don't want to have less options.  We were looking to switch but then they extended the shelf life of Pathlore so we stayed with the product that has served us well for many years.  I was not here when they chose this originally so I can't tell you why it was chosen.