@expatATCO,
having no idea to say YES/NO to your decesion but it seems(upon my research) that IAA offer is not anything special.
Do not expect that you will save more than 1000 Eur/per month,after all payments(tax,health insurance,appartment,utility,food...).
I don't know where you come from but as lowest paid rdr ATCO in Europe after all those expenses(mentioned above) 600/700EUr remains.
So I think that IAA offer is not :
those who don't risk, don't drink champaign
I don't know what exactly they offered to you,but I do not believe that full salary will be paid before rating/endorsment for particular sector(s) .
Some other solutions seem to be better,and as shortage of ATCOs (so I have been told
) exist expect even more better offers in near future.
If you have strong wish to leave your employer
,or you are looking for change and challenge
in your life than wait for a little.
With 27 years,all ratings and ability to move you are in better position than many ANSPs around World. They need you.
Anyhow,
best wishes in any directions you decide,