I am flying them with 14X8 Graupners on a flat CS8 and 15X5 Xoars on a CS X8. They work great for me with 9 -11 kg AUW and WKM on both.
https://vimeo.com/58957377
Looking forward to your results because mine were totally opposite to what was said above by others. Its easily as stable and solid as MK Bl's for AP purposes. I2C still sucks for other reasons :(
A fire extinguisher isn't for the lipo... its for the fire that the lipo starts. Luckily this one had cement and it wasn't an issue but in a dry grassland etc. its a different story.