I have 2 xp3's and a 2260 on my 240, I added the 2260 after I had the xp3's on there for bout a month. I bought one new for 130 and bought one used for 60. I would buy them used if you can and dont pay over 80 for a xp3 or xp4. I think they are great as far as reliability and I would def buy another on used for 60 bucks if I came across one and was looking for another filter. I have the 20 and 30 pads also on my bottom tray, bio in the middle, and filter floss on the top. I will say I wen about 3 months with out cleaning one to see how it effected the flow and it suffered dramatically, I would say it was doing about 20-30% of what it does clean, however that will differ as far as you stock goes,ect. I think they are easy to clean and maintain also though.