Like any large organization, Frigidaire offers a few models, with product lineups changing periodically, so be sure to review what's currently available online at sites like Amazon or eBay.
The current models readily available online are the FMP330RGS and -RGB (same model, in white or black) both of the upright console style, which make great impromptu countertops. If the kitchen is set up to accommodate one of these freestanding models, you can expand countertop space instead of just taking up floor space.
The units work by hooking up with a faucet adaptor to a regular sink faucet, filling up the unit and draining the used water into the sink. At about the same size as the average compact dishwasher, the units are big enough to accommodate families if run frequently. They offer different settings, multiple racks, and other features of a standard built-in unit.
As with any appliance, reviews are fairly mixed, with durability, cleaning efficiency, and price being the most often cited issues. The news isn't all bad, with plenty of people adoring their Frigidaires, but just make sure to check out similar models from competitors, such as the Danby portable dishwasher, which is also cheaper.
Also, check out the eBay listings below, which offer different models, such as the FFPD1821MW, which is a newer model. Reviews are not yet out there, but it's worth checking out.