Well to start with:
If you've watched many games in which Cory Jane has played for the All Blacks, he's been one of the most consistant and dangerous attackers in world rugby. Hs plays fullback for the Hurricanes, so on the wing he's got very good core skills. He takes the high ball probably better than any other winger in world rugby, he has a very good kicking game, and his counter attacking has been exceptional. He also reads the gaps very well. Probably his best asset is his fend, which is undoubtably one of the best in world rugby. He keeps the opposition at an arms length and then pushes them off. Just some of his tries for the All Blacks.
http://www.youtube.com/watch?v=CpXq9uxreoM
http://www.youtube.com/watch?v=jeugcB5SZNw
http://www.youtube.com/watch?v=Zw_oybnn7Sw
http://www.youtube.com/watch?v=RiSzoedMl-E
As for Conrad Smith, everything he does makes him brilliant. He organises the defense perfectly, makes pretty much every tackle and contests for the ball. He is very strong which people don't seem to realize. He makes so many breaks for the All Blacks just off of picking the right holes to run into. He can also finish tries very well. He's the fittest All Black this year at least. He just never makes a mistake, and makes everyone else on the field look exceptional. In terms of how he scores tries:
http://www.youtube.com/watch?v=LSyqLw997WI (Look how far he has to run. The fitness is amazing)
http://www.youtube.com/watch?v=Jnbc4wAddKI
http://www.youtube.com/watch?v=UreCrkczAl4 (0:14:00)
http://www.youtube.com/watch?v=8IdlG1jtkH0 (good tribute video, highlights his play well)
As for Ben Smith, he's just been a very solid player this season for the Highlanders. He counter attacks well from fullback, creates play well, kicks well etc.
None of the players you have mentioned are speedsters, they just make the right decisions at the right times.
As for is Guildford faster than Maitland. At a guess, hell no.