I'm due to make my second batch soon. For me it has worked very well and I intend to carry on using this spiced oil and onion/pepper paste. The preparation is probably a bit less time/effort than making a base although you still have to make a base gravy as well, of course.
Regarding the chicken flavour, this comes from using the oil to pre-cook your chicken.
Pete (sced) makes reference to this in his posts. This I haven't tried yet.
Cheers,
Paul