Mark
I've had the JPT 310 for about 4 years and a better machine for the price I don't think you'll find.
It is easy to use and accurate, I do believe that the fence has been modified since I bought mine, ,having said that I've not experienced any problems with mine, although some posts in the past have indicated that some fences have not been as true as they could be.
One of the problems I found with mine relates to the female socket on the machine, because my machine is on castors, the plug kept coming loose as the machine was moved around. I solved this by hard wiring to a junction box on the machine.
The changing from planer mode to thickness mode is very easy and takes seconds. Not to sure if its still the same but all locking devices are done by Bristol Levers, I find these a pain on machine because there's never enough room to swing then round 360 degrees, I removed all mine and made knobs which work out much better, mind you this is a personal preference.
In the 4 years I've had the machine I've had to realign the tables once, this is very easy to do, all you need is an allan key and a straight edge.
The cutter knifes are very easy to set once you have sharpened then, fine adjustments with an allan key will do the trick. The extruded aluminum that they supply for measuring the height of the blade IMO is worthless, I have my own made of wood and find it easier to use.
All in all if I was in the market for another PT would I go for this one. The answer is yes, even with its minor faults I still think it's a very good machine.
As to the price I'm not too sure if you'll get it anywhere else cheaper.
I know a few others have the same machine, they'll probably be along shortly.
Hope this helps.