Is this combination of any worth technically for c300 users?

No users experiences to be shared here?

Well it will work and give you a higher bit rate recording which will help reduce quantisation noise, which in term will mean you'll be able to push footage harder in post. However the shuttle is big and heavy, does not tell you how much recording space is left on your media and any settings changes require it to be plugged into a computer. I think a Samurai or Ninja is a better option.