We used the Rees System (Including Centron) for 15 years and a little over a year ago switched to CIMScan by CIMTechniques in S.C. Both systems do, basically, the same thing but with different architecture models. We found that even though Rees Scientific was a bigger company with a larger install base, service and support were actually pretty poor. CIMTechniques is a much smaller (up and coming) company but as such they were "hungrier" and much more responsive to out needs. It is a trade off, to be sure, but thus far we are very happy with our choice. We looked at the newest Centron system, Isensix, MACK, Veriteq and CIMTechniques prior to sending out our RFPs. Oddly enough, I never looked at the Temp Trak but the system looks very similar to the others.