@vinvac:
AFAIK all the Tacony machines (Riccar, Simplicity, but also Carpet Pro and Fuller Brush) use bags. As such, they offer some of the best filtration around. They earn top marks on deep cleaning, too, for both canisters and uprights.
As far as all looking the same, yeah, that's true enough. Panasonic, Tacony, Miele and even Sebo are using the same basic designs for their canisters. Uprights are much the same - they're either bagged units copying the Panasonic clean-air design, or bagless mostly copying Dyson/Fantom. Most bagless canisters are Dyson workalikes, too.
The main exceptions are the old standbys - Filter Queen, Tristar and variants (Vortech Force, Patriot), Silver King, Black Knight (Air-Way/Sani-Clean clone), Royal (but only the metal uprights), Kirby, Rainbow, and in a way, the classic-styled Sanitaire and Hoover Guardsman uprights. That used to be the standard picture of "what a vacuum cleaner looks like", and now hardly anyone makes them like that anymore.