If you're really, really happy with the job then maybe.
I was in this situation a few years back and like other respondees, accepted and then left anyway a bit further on. The main problem I found is the resentment (real or otherwise) that built up, on your side - why couldn't they pay me more without me having to take this step - on their side - he's an untrustworthy guy who held us to ransom....
at the end of the day it really depends on the relationship you have with your bosses and understanding they will be.
If you're really, really happy with the job then maybe.
I was in this situation a few years back and like other respondees, accepted and then left anyway a bit further on.
The main problem I found is the resentment (real or otherwise) that built up, on your side - why couldn't they pay me more without me having to take this step - on their side - he's an untrustworthy guy who held us to ransom....
at the end of the day it really depends on the relationship you have with your bosses and understanding they will be.