The Austrian made Adec handpieces such as Synea, Trend, and TopLight, are very quiet, with the high pitch normally accompanying this level of cutting power basically nonexistent. Adec/W&H highspeed turbines can easily last 18 months with proper lubrication.
The A-dec Synea TA-98LED is just another testament in the long list of innovations from this company. Extreme power @ 20 Watts, and Penta Spray which atomizes water in a cyclonic form from 5 separate ports. All this at a total weight of 25% lighter than Synea's nearest size competitor.There's a reason you don't see many A-dec highspeeds
listed on Ebay. Doctors typically will not part with them. Those same doctors grab them quickly when they see them available for half the normal price.