It's a very live sounding, very heavy, very much a "player's" keyboard - there's none of the karaoke features, mp3 playback, any of that stuff - with by far the best sounding piano (IMO) in any arranger, some very live sounding drums, a great B3 sim and a nice easy to operate OS.
If you want to edit, create or assemble your own styles, it's on-board tools are about the best, it's SMF playback is probably as good as it gets (it's Roland, after all!) and the SMF editing tools are again by far the easiest and best in the business.
It's built like a tank, weighs like one
, has what a large number here admit is possibly the best feeling plastic semi-weighted action on the planet (never played better, myself), a very easy to use color touch-screen, and just about any sound you need...
Some people love them, some hate them. I think, primarily, that most of the 'haters' are those coming from Yamaha's, which have an utterly different 'sound', an utterly different OS, and different general direction, IMO. But if a 'live' sounding, rather than 'CD-like' keyboard is what you are after, this one should be high on your list.
Now, here's the stuff that most owners won't tell you..! No multi-pads, no audio recording, did I say heavy?
No synchronized SMF and style playback (but who uses that much?), no break/fill (but a break), and here's the real difference... In all honesty, the guitars on it are not quite as good as Yamaha and Korg. They are good enough, but nowhere near as realistic as Yamaha's Mega guitars. If really good guitars in the style are your MAIN priority (more than a good piano or good drums), then possibly a T2 or S900 might work better, if you can work with a 61.
So... no it's not perfect (don't let anyone tell you anything is that!), but it has a sound all it's own (plenty of factory and user demos out there to listen - go to Roland-arranger.com for a large collection) and, if you find it suits you, trust me, you won't be getting rid of yours for a while!
I do a combination of solo, duo and full live band playing, and I have to admit that the G70 is by far the best thing I've ever played that covers all the bases. Good enough for a solo, maybe not the best, but very close, and punchy and ballsy enough to not get buried in a live band situation. Easy to operate on stage, and with FantomX and VK-1 quality sounds that need no apologizing for in a 'real band' situation.
3rd party styles abound. Admittedly, perhaps not as many as Yamaha, but still FAR in excess of Korg. Plus a few good commercial style makers, notably MidiSpot, with styles that rival the factory ones. Plus, as I pointed out at the start, of all the arrangers out there, this one is the easiest to edit, create and re-assemble your own styles. Making it easy only encourages you to try, and that's half the battle!
Only you can decide for yourself if the G70 suits you, but there is enough online for at least a decent impression about the sound. I have a feeling that, because there is no replacement model for it (yet), it ought to hold it's used value for quite a while, so you shouldn't take a bath on it if you buy used, and decide it isn't for you.
Best of luck...