Had it for years, love it. Well worth the price.
True that you have to cut the pipe, but its no big deal to source another one.
After using one for a few years, I have included my thoughts below, pro and con.
Enormous battery storage in a small stock.
You no longer have to go out and source a real steel "Entry Stock" and dremel it out to fit a subpar battery.
It is approximately the size of a crane stock, fully collapsed. Perfect for people with shorter arms, or those who wear vests and find the length of the M16 (or even the MP5kPDW stock) too long for balancing the gun they have. Younger players who have not fully grown yet will also appreciate this stock.
NEVER use the sling mount- you will strip the screw, and this screw holds the backplate onto the stock. Invest in a side mounted sling swivel.
The top screw can dig into a battery, shorting it and causing a fire. (or at least a smoldering burn) either way it will keep you off the field or worse. Cover the end of the cells that are up top with thick tape to avoid this.
You will need to relearn muscle memory when shouldering this gun if you are proficient in point shooting with a regular stock size; if you do not practice snap shooting with this stock, you will aim your muzzle up higher than your intended apparent target. This is no big deal, just embrace it and practice.
Both screws will strip the threads of the stock if you overtighten them. Every time you recharge the battery, do not hard tighten the buttplate screws, just enough so that they are not loose.