I have used Geochempet for more than 15 years for my petrographic slide preparation, and have always found that they provide excellent, prompt service, and quality slides. It also helps that the owners are experienced geologists and understand the requirements (including dealing with occasional poorly documented rock/core submissions from clients). I have found Tom, Ken, Heather at al. to be always available for phone updates on progress of work submitted, and to be reactive and helpful in dealing with any problems arising in preparation of difficult samples. I strongly recommend Geochempet Services for quality thin sections.