PowerTECH's ROCE trend is concerning as the company appears to be losing market share despite reinvestment efforts. The decrease in ROCE and sales, coupled with increased capital employed, are alarming. A positive shift in these metrics is needed, otherwise, it may be wise to consider other options.

High P/S ratio may reflect expectations of the company outperforming the industry. However, with recent revenue trends and slower growth, there's a risk of share price decrease. Current share price may be unreasonable unless conditions improve.