I have had a Hakki Pilke Eagle PTO version for nearly 2 years now and im very pleased with it. We always use it with 2 men on it and it works fine, occasionally if the saw is cutting a very thick piece of wood the man on the splitter will need to hold off for a few seconds until the machine picks up speed again but generally it works well. We can fill a wheelbarrow of logs about every 3 minutes this way. The TCT blade should last for 40+ hours before needing resharpened providing you don't go through too many nails, barb wire, etc (which is inevitable) and the belts should last about the same length of time, although you will need to tighten them every 5-10 hours ive found. We now keep the top cover of the machine OFF so we can keep an eye on the belts. You can get the belts off ebay for about £6 each.
There are a few problems with the machine though, at the bottom of the blade compartment there is a very small thin steel grill which is meant to allow sawdust to escape but frankly its useless, we had to cut it off with the angle grinder as it kept filling up with sawdust/shavings and slowed down the blade. If you are buying the machine this is the first thing you should do in my opinion. Another let down is the brake pedal, when the blades/splitter gets jammed, and it will do quite often, you push this down with your foot and it disengages the belts. In theory this is a great idea but we've found that once the belts are disengaged the shaft is still spinning and creating friction with them, and after a few seconds you can smell them burning, we get around this by disengaging the tractors PTO as soon as there is a jam but no matter how quick we are there is still some damage caused to the belts.
However despite these small issues I would still highly recommend the Hakki Pilke Eagle, its a very productive machine for the price and the PTO version is very cheap to run on a small tractor drinking red diesel. I got mine from M Large for around the £1700 mark if I remember. Let me know if you need any other info.