Well not true. An SP on/off adapter is perfectly usable, and NDZ have released one also. Adds an inch to the length, which if you think about it, isnt much.I've got one, and like the guys said its really good value as you get something which can esily perform as well as any Matrix or Ego etc for say half the price (if bought new).
The only draw back is that there is'nt an on/off and there is no way you can get one.
Overall, a very nice bit of kit