I haven't tried radsails new thingymajig. They are a decent company but the kites of theirs i've tried so far don't live up to their competitors - you
get for what you pay in this case... but i can't say fairly about this new one! Hopefully they aren't using the nasty material they used on the
radsail pro. (I'm comparing the radsail to a blade)
Frenzy's are a fantastic kite all round and you have the comfort of knowing they're such a reputable brand in their 5th generation (i think?) of
Frenzy with thousands of users you can find out about them get help with them etc.
The montana is actually a really good, solid kite with plenty of lift and stability. It flies a lot like the 05 frenzy and is definitely worth a look
for the price.
You should look into flysurfer as well, ohh and Ozone are realeasing a NEW closed cell depowerable as well soon!!!! VERY exciting!