I purchased an Ibanez sg300 a two years a go as my first bass. I love the slim neck and it was a great learning bass. Since then, I have purchased others such as a rw pbass, jazz, etc. So now I have a good grounding regarding various bass electronics, pups, etc. I felt that the stock pups on the sg300 were ok but I changed the pups to Bartolini MK4's. Big difference!! Just wondering if any one out there has experience with the Bartolini MK4's and what are your thoughts?