My first was bought from Dynamic .... (forgot full name) and IS excellent.  The second was bought from SJ computers LLC and is a very annoying P.O.S.  Upon arrival I had to call them as it wouldn't work- it turns out the RAM was loose.  Now it's intermittently Blue Screen of Death.  Unfortunately during the holidays, due to family issues I wasn't able to sit down for hours upon hours to solve the problem.  Upon opening the system, I discovered  SJ computers used the unknown brands of RAM and Hard Drive.  I fully do not recommend SJ Computers.