Lenovo's M91p SFF is a great little computer.  The refurbisher did an excellent job - the entire computer looked and acted like it was brand new.  The first thing I did (being a geek) was to take it entirely apart.  I found the inside looked and acted acted just as new as the outside.  I added my own video card to upgrade the graphics and I now have a top-of-the-line computer for a rock bottom price.  Couldn't be more pleased with it.