if you are already in a leading MC org.. why join IBM? with your reasonably good yrs experience (I am assuming that you have a level of specialism gained from those years of experience) then you'll just end up as band 8 with maybe 55-60K base salary.. car allowance is not a guarantee as they are changing the policy on this for band 8 and lower. Also, given that they've recruited a lot of new staf in S&T, your chances of getting promoted is really tough... finally, S&T is not doing particularly good in the past few qtrs now.. so you might just end p doing anything just to get you billable.. at most, you'll be doing PMO role in one of their SI projects...good luck.