I started my residential ATPL with cabair (OFT) not to long time ago.
Im very very happy with it. 10 of 10!
Many guys in our class going for "bristoling" questions, just memorizing them, by taking online test 100 times. Be aware of that when doing distance learning.
You will pass test if you bristol everything (with score of 80-98), however, you will not be able to explaing, as example, why induced drag is lower with increased aspect ratio. And that may hunt you back on job interview (where there is no multiply choice answers) or while flying.
For distance learning, I belive Cabair use same manuals as for residential. They are decent, but not too good. However, they gonna get new ones within a month or two, which supposed to be much much better.