Have used Jet Tech for some years and had only one problem which was sorted out immediately by Customer Services.
Discovered I'd run out of one colour - time to restock. Ordered Thursday night (I mean night!), despatched Friday and arrived here in Belfast Saturday morning. That couldn't be beaten. Add in the quality - these JetTec cartridges are every bit as good as the Canon originals - and the price and it's a no-brainer. I've been a customer for years, and do recommend you to all my friends.
Very good price & prompt delivery, almost by return of post.
JetTec compatible cartridges are the only ones which give satisfactory print results all the time. I wouldn't use any other make.
Good quality, long lasting, and very speedy service