Hi OP,
Propilot was my first choice, seeing as I'm from the midlands it only made sense to go DL with them!Nothing bad to say, the material was Grade A on the Ipad & if you are looking to embark on the self learning /DL path, I suggest you knuckle down & get really acquainted with the tablet/digital format of the material in the course (I believe you are able to download samples from Itunes) is presented.
My experience with Propilot was overly great, took me 9 months (DL & finsihed all exams in October 2013) to knock out all 14 exams alongside full time employment & thank god for passing all that first time around (Mean Mark of 91% overall)
. They also encourage past/present/future students to come along on various organised events (tjhey tend to host various PDP's, lectures & talks & recently a CBT program/project) that take place over the year.
Goodluck on your ATPL endeavours mate