I own both the popular&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Sonic-Wave-CD-2800-Ultrasonic-Jewelry-Cleaner/dp/B001DKDAVW/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Sonic Wave CD-2800 Ultrasonic Jewelry Cleaner</a>&nbsp;(purchased from Amazon) and this CD-7810 model (purchased elsewhere).

This CD-7810 model costs a little more, but is worth it if you're going to be using it very often.

The controls on the CD-7810 are more flexible, making it easier to run a cycle for up to 8 minutes or multiples thereof.

The control buttons on the CD-7810 are in the base, not in the upper lid, so there is one less item to wear out, the flexible cable to the controls.

The on-off button on the CD-2800 wore out on me after a couple of years, becoming increasingly difficult to push.  So far (a year now) the CD-7810 shows no signs of its buttons doing that, though I haven't had it long enough to say for certain.

The CD-7810 seems a bit heftier and better built.