Well, I will share my experience with you.
Few months back I was preparing to do the TOFEL PBT, it's unfortunately the only available test after passing through a whole year of war (in Libya).
I was surprised now after receiving my score reports and sending it to the admission office of one of the British Universities, that they accept only iBT or ILETS.
A dear American teacher I know from the facebook told me that the PBT has been withdrawn widely for being less secure and not including the speaking section.
I was so sad actually, been preparing for the test long time ago and, but now have many doubts and had to defer the offer.
My question is, is this test acceptable by other universities than the one I'm in contact with? something else, can I rely on my score to estimate my language accurately?