MP10 is a good powerhead. I’ve owned several MP10s over the years. I currently use 2 MP10s on one tank and 2 MP40s on another tank. The 2 MP10s are probably 5 to 6 years old or even older, and they still work perfectly. However, one or two of the MP10 wet sides were replaced over the years. Replacement wet sides are currently $65, but used to be around $50. Also, the controllers were upgraded once or twice. The controllers are currently QD, non-mobius.
Some MP10 cons:
1) They’re somewhat delicate. Dropping the dry side or wet side or damaging the wet side during cleaning is likely the culprit for many MP10 problems. I’ve seen many tanks photos in which the dry side is not properly secured. The dry side sticks out by over 2” and can easily get knocked off of a tank if it’s not secured. A replacement dry side can be purchased for $111, but for close to the price of the replacement dry side there are other choices. A new Nero 3 is $150 and a Maxspect jump gyre 2k is $159 on sale (Neros and gyres weren’t around when I bought the MP10s).
2) They can be noisy if the sides aren’t lined up properly, but this isn’t much of an issue. Lining up the sides just takes practice. They are also noisy if turned up high, but this is also true for Neros and gyres.
3) The dry side “wart” on the outside of the tank can be distracting when not viewing the tank up close. The dry side is the size of a small orange or large tangerine. The dry side cord is also going to be visible on the outside of the tank and it’s a medium-sized, thicker cord.
4) They’re expensive. Nowadays, in general, I’ll choose a Nero 5 over an MP10 because of the strong yet gentle wide flow and lower price. In a 20gal or smaller tank I’d probably try 2 Nero 3s. I used to run 2 MP10s on a 20gal AIO before Neros existed. I’m currently several Nero 5s in my tanks.
5) Flow is narrow and direct in comparison to a Nero 5.
Some MP10 pros:
1) Less heat in the tank.
2) No wire in the tank. Less risk of stray current and the tank will look great when viewing the inside of the tank. Probably the least distracting powerhead when viewing the inside of the tank.
3) Can connect to a battery backup either Ecotech or DIY. Can run for days on battery power. A major plus if your place is prone to power outages. I’d buy MPs or Tunze DC powerheads instead of Neros if my area was prone to power outages.
4) Easy to remove, take apart and clean the wet side without untangling cords or dragging cords throughout the house. You could even keep a spare wet side around and then swap the dirty wet side with a clean wet side when it’s time to clean the wet side. Of course you’ll still need to clean the dirty wet side.
5) They last for a long time, at least they have for me. My 2+ year old Nero 5s are also running just like new, but the Neros haven’t been out as long. Nero longevity is unknown.
6) Replacement parts are available.
7) The controller has colored lights. The controller visually shows the powerheads mode and speed via lighted dots and a lighted center knob. This may be important to some people and it still looks pretty cool to me even after seeing them for years. In comparison, the Nero 5 physical controller is minimalistic with no sort of wow fun factor.
8) Sometimes slightly used MPs can be found for a good price. I picked up a used MP10 over 10 years ago, bought a new wet side and still paid much less than new. That MP10 lasted 10 years until I accidentally dropped the dry side.
Hope this helps.