Quite agree Whirlybird - well summarised.
And further to my earlier post, the 2 really great instructors I had from Cabair were both on a 2 year then (hopefully) into the airlines deal, so in itself this should not put you off.
The 2 really !!!!e ones were not on such a deal.
I was mid IMC training when one left for his airline post and he was the height of dilligence in ensuring a smooth hand-over to the next instructor - so if one is near the end of his contract this need not be an issue either.