I have the Datel one which came with a (faulty) 4 gb hard drive, and it is quite useful (the Hard drive will be exchanged soon, but..... anyway). But just a word of warning: the Datel battery has twice the charge....because its literally twice the size. It comes with an alternate battery cover thing to house the monster. It lasts forever, but feels like your holding a small dog in your hands. if you have the external hard drive (which its mostly packaged with), it feels balanced, as the HD bulges out too. Otherwise, be carful.