Brake Pad Life (Shimano Sora)

Greetings
Bought my Giant in October of last ear. Been happily commuting in it since then along with the odd Sunday ride. Done just over 700km now.
I have gathered that the pads are considered nearly worn out when you can't see the grooves anymore. Can someone confirm if that is right?
You cant see the grooves on the rear, but the front still has a bit to do. Is 700km all I should expect out of a set of brake pads?? Wheels on the Giant are standard Mavic MXP22s. I do rub them down every few days with baby wipes, but I didn't do that from the start.
Thanks in advance
Bought my Giant in October of last ear. Been happily commuting in it since then along with the odd Sunday ride. Done just over 700km now.
I have gathered that the pads are considered nearly worn out when you can't see the grooves anymore. Can someone confirm if that is right?
You cant see the grooves on the rear, but the front still has a bit to do. Is 700km all I should expect out of a set of brake pads?? Wheels on the Giant are standard Mavic MXP22s. I do rub them down every few days with baby wipes, but I didn't do that from the start.
Thanks in advance

2010 Giant Defy 2 running SRAM Force and Shimano RS80/C24s with Continental 4 Seasons
1999 Carrera Integer MTB
2014 Planet X SLX
1999 Carrera Integer MTB
2014 Planet X SLX
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http://www.wiggle.co.uk/kool-stop-dura- ... e-inserts/
Best of luck with the Salmons
Thanks for the reply. I am pretty heavy on the brakes. I do a fairly urban commute and I prefer to use brakes to stop rather than car bumpers
I'll take the plunge and buy Salmons and maybe look at 105 calipers in the long run.
1999 Carrera Integer MTB
2014 Planet X SLX