As has been mentioned the Archer III is essentially the same airframe as the Warrior.
The extra power is certianly noticeable......giving almost sporty takeoff/climb performance when lightly loaded. Also the higher load capacity is very welcome, making the Archer III a true 4 seater/ full fuel aeroplane (so long as all your pax are not on the portly side!)
I did find on the one I flew that the extra power would be better put to use with a vairable pitch prop.....I found that when cruising over 120kts an eagle eye had to be kept on the revs.....it would certianly be possible to exceed redline at high speed......the one I flew might have had a fine pitch prop fitted for better takeoff performance....but running out of revs at high IAS was an annoyance.
There are slight changes in the cockpit, alot of the switches have been moved to the roof panel above the windscreen......so you can pretend you're flying an airliner!