I used Skye once and it was lightning fast shipping. Like it was sent out right away after ordering. I also emailed them a few times with questions (it was my first research purchase) and they answered quick and very helpful.I have several months of research experience with Tz and I'm currently experimenting with their T30 and can confidently say it's highly effective and spot on (probably heavy dosed which may be a bad thing for some). I did change to another option only due to the cost savings of a CN vendor without adding much more risk. The fancy labels are nice though and I would use them again without question if I needed something with practicially next day delivery and a polished presentation.