For £69, I would upgrade, even though I have lounge access, as the TPs are often useful and I enjoy the benefits mentioned above. You may well, however, have a better use of the money.
I was in AMS a few weeks ago, and the lounge has been renovated, and looks much better. The food/snacks are limited, but the drinks choice is reasonable.
Please let us know what you decide, and if you do upgrade, your comments after the journey. Thanks.