They're good, but I would buy them from T1 direct, since they're the ones who actually helped develop the kit (along with Maxwell I believe), and will be much better able to answer any questions you may have:
KEEP IN MIND that this is not a real
top feed conversion kit, it will ONLY work with the ID injectors that have been specifically modified to work with those rails. The kit works great, but just be aware that if you decide you want to swap to some different top feed injectors later on, it'll have to be to one of the few specially-modified ID ones that are designed for this kit. You can't just swap in any top feed of the street. Even though it's not on their site, T1 will separately sell you the ID injectors that work with this kit (if you want to change sizes), just call and ask.