I know in general these posts are old but it appeared high on my search for IJT and I felt given so much negativity I should should my experiences.
I have only been using IJT about a year but have had no problem at all in regards to hassle about orders etc (but maybe this is because I am quite frequently using them), however still the only e-mails i get from them are to occasionally check if everything is all right or if they have any particular specials they think i would be interested in.
In regards to the quality of the toners I can't say I haven't had any problems with the refills as I have but no more than i have with any other recycled toners.
Furthermore any time I have had any problems they have replaced the toners without question. On one occasion I had a slightly more serious toner leak, they offered to repair or replace the printer but I fixed it myself, because I fixed it myself they sent me through a box of complimentary toners for it.
I am very happy with the service and prices they give us, although am very intrigued by the cheap prices through e-bay!