I didnt know Mapex as a really well known brand. Ive always heard of Pearl, or Tama, or DW. I got a Mapex QR set because it was the only one they had at the music store and It looked really good and it was cheap. To this day I am still happy with it. If only I had the bucks to spend to get more drums. Mapex does offer a 10" Tom extention on their website but I dont know of any other additions.