It is a 2.2kW water cooled spindle that I bought off eBay. I got it from the company that used to be called LoveHappyShopping. They are all the same units and you can buy it from stock at
http://www.automationtechnologiesinc.com/I used to use a big Porter Cable router, but I finally got so sick of the noise. The massive amount of air the Porter Cable puts out also tends to make a mess, especially with wood and MDF. The unit is very quite and well balanced. Most of the noise comes from bit and nut. It is virtually silent with no collet and nut.
It is probably more power than I need. I have never seen it slow down under load. I do not have speed control via Mach3. I just set it on the VFD panel. A Mach3 controlled relay turns it on and off. I have it take about 3 seconds to ramp up and down. You can do active braking too if you want, but you need to add some load resistors.
I use a simple 5 gallon plastic bucket for the cooling. Yesterday was the first day it actually got warm and that was after 5-6 hours of continuous run time in a very hot shop.