Hi Mark
where to begin ??
some questions
what are you looking to learn from the experience ?
have you done any off roading ?
why go for a 125 and not ( for example ) a 600
why not use the GS for commuting ?
how much damage do you think that you will do to your 1200 and how much do you think it would devalue it ?
how long do you plan on keeping it ?
my two penneth
I started off roading on my 1150 adv a year ago, I hadn't been on anything other than the blackstuff before that ( although I do have 23 years riding experience )
the bike has cost me 10 k to get it how I want it, not that much less than your 12
I still consider myself only slightly better than useless off road
however,
the most fun, hardship, stress and outright fear have come from learning to ride the GS off road and I have loved every minute of it
riding a gs off road (for me) is about picking your route and balance, not speed as that will **** it, they aren't built as racers, that said you can nip along
the damage so far has consisted of a slightly dented tank ( something that the 12s aren't prone to ) and a scuffed mirror, handguard and cylinder head, about £300 in real terms. I think this is a small price to pay for the fun that I've had
I think that if you rode the 125 you would be bored senseless in no time ( and so will you Gaz)
if you want to go out on the smaller bikes why don't a few of you with them get together, buy a couple of OS maps and find the paths marked up as byeways open to all traffic and go ride them ?
I just don't think that you would learn anything from riding a 125 with people who are riding the pigs
better still bring the GS and have the laugh of your life, you won't break it and you won't get grief for not doing something that you think is beyond your limits
I hope this helps
if it doesn't then pm me and we can have a chat on the phone
all the best
Rob