"Yvo, Thank you for your help. You guys are so professional and effective, as always." February 2013: Ivan Wong, Site Engineer, Keller Ground Engineering, Brisbane.

"If the data is from Yvo you know it's right." December 2012: Principal Geotechnical Engineer, GHD, Brisbane.

"Yvo is far and away the best CPT provider out there." 2011: Principal Engineering Geologist, Geotechnical Engineering Consultancy, Gold Coast office.

"Yvo uses the best, most sensitive equipment to get the best results." 2011: Managing Director, Geotechnical Engineering Consultancy, Brisbane.

"Yvo does twice as much testing (in metres) per day than anyone else, so he's more cost-efficient." 2011: Managing Director, Geotechnical Engineering Consultancy, Brisbane.

"I have used CPTS since it started operations. I have nothing but praise for the professionalism of the company. Its equipment is always in immaculate condition and it is operated expertly – no pore pressure drop-outs, no negative resistances, none of that rubbish to cope with. CPTS are strong on innovation, though locally that does seem to be the hallmark of the "industry". However, as well as being technically excellent, CPTS is a pleasant cooperative firm to work with." December 2012: Peter Stocker, Principal Geotechnical Engineer, Golder Associates, Brisbane (now retired).