I have been a long-time Sonicare user of 13 years. I own both the Philips Sonicare Elite e9500 and the&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Sonicare-Advance-4100/dp/B00008BFXG/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Sonicare Advance 4100</a>&nbsp;Sonic Power Toothbrush. The Sonicare Advance 4100 finally conked out on me after 13 years (I suspect that its Nickel Cadmium battery has finally used up its recharge cycles since Nickel Cadmium batteries have a finite number of recharge cycles (about 1000)). I have had my Sonicare Elite for 2 years and I couldn't be more happy with it!