Be interested to hear how you get on with the 703, I've been eyeing it up for a while...
Very impressive so far. Got a nice rubberised grip, pretty light, responsive buttons and no issues with the wireless performance at all. Hard to say about battery life but it seems pretty solid so far, can see myself getting at least a good 3/4 days out of it, possibly even longer (all RGB lighting off).
Shape wise, it's comfy, hard to say which shape I prefer between the zowie fk 1, deathadder and g502.... All have comfort in their own way.
One thing which is great though, is being back on wireless again, so nice not having wires. Would have liked the g903 but couldn't justify the extra cost plus I think I prefer a right handed design over ambidextrous.
EDIT:
Battery life is very impressive so far too.
Started of with a 55% charge iirc and it is now at 16%, so that is 3 1/2 - 4 days of battery life...... With a 100% charge, I expect to get a full week out of 1 charge
EDIT:
And a full charge takes about 1-2 hours.