I had 3... So obviously I'm not afraid to buy one, they're awesome! The first one was what gave me the confidence to fly KE and start to feel comfy on as balsa plane. If not for a mid air, I'd still have it!
I sold the second as I just never clicked with the yellow scheme (they're slower, right Mike?)
I sold the third one at FLI Dallas; since I don't have a close field, I don't fly frequently. When I do go, I like to fly my big gassers, so the Vyper was just sitting around.
So what I'm getting at, is that it is definitely a fun airplane. I like that it can fly in plenty of wind easily, and also how well it locks in during KE, point rolls, and other precision maneuvers.
Also, if you set it up on 3s, you can use the same batteries as your 47" SHP.
Hope this helps!
-G