The TF-100XL (which uses Taylor reagents) is useful if you are going to be shocking your pool and doing a lot of high FC measurements using the FAD-DPD chlorine test. Just keep in mind that some of the reagents don't last forever, but if you store them in a cool dark place then all should be good for at least 2 years (Taylor recommends changing them every year, but that's being conservative). The indicator dyes, such as used for the pH, TA and CH tests, and the FAS-DPD titrating reagent are the most sensitive; everything else will last for many years.

Taylor has a nice article on Recognizing a Compromised Reagent.

Richard