I just spent four days on the 10m razor using a 2010 rise bar so time to comment. My current quiver is the 10m razor and 2010 - 7, 9, 11 rise kites (mako 140, surf coming), I weigh in at 155lbs. The wind was around 20 to 40km and I used both 21m lines and 24m on the razor. It took an hour or so to become comfortable and not so yanked around (basically just more pull) but I trimmed it up got more used to it and then….I fell in love with the way it jumps, and has that constant power. I only use the 21m lines now unless it’s very light and then I go to 24. The kite has very good range on 21m lines (with the freeride bar at least). I had seven other riders (3 OR rise, 1 OR one, and 3 misc riders) try it and nobody had any complaints, they all liked it right away and more.
The 10m razor effectively replaces my 11m rise (my biggest kite), and I never felt the need to pull out the 9m rise (although i did try them back to back to see the difference, and yes, they are different kites as has already been discussed). So I was able to comfortably use the 10 m razor right up to the point where the 7m rise kicked in at ~40km. If I chose or was restricted to 2 kites it would be the 7m rise (an incredible kite in 40 to 65 km) and the 10m razor, a perfect 2 kite quiver for my weight in my area….(but could the 6m razor replace the 7m rise and give similar performance and range?)
A 3 kite quiver would be a 6-8-10 razor or alternatively 7m rise-10m razor-13m rise if you really wanted to power up and had consistent light wind days.
I really like the kite, took a little time to fall for it having never flown anything but high depower kites (mainly ones and rises), but bottom line – the razors a blast and allows for lots of skill progression.