With the telecommunication bands demanding growth, Piezo on Insulator (POI) technology enhances SAW filters performances. This panel intends to highlight the value of the POI technology and compare it with existing alternatives. Rich Ruby's abstract: In the early 90’s, the first piezoelectric filter based on acoustically generated surface waves (SAWs) were introduced into the mobile space. In 2001, the first Bulk wave acoustic devices (BAW) for the mobile space were introduced. The first and most dominant version of BAW are the FBAR (Free standing Bulk Acoustic Wave Resonator) filters. Significant innovation occurred for both surface and bulk wave technologies as they competed for slots in a mobile device. Soon after FBAR came out, SAW engineers introduced a Temperature-Compensated SAW. In 2016 FBAR introduced Aluminum/Scandium Nitride (ASN) piezoelectric films. ASN has much higher coupling than AlN. Almost like clockwork and in lock step, a new SAW technology Guided Wave SAWs (GWSAWs, a.k.a. POI a.k.a. Incredibly High Performance Filters or I.H.P.) were introduced. A perspective of the pros and cons of both technologies will be discussed