I don't know how much those ones you're talking about cost, but I've tried them both, and
far preferred the one I ended up buying; the Empress Tremolo.
http://www.empresseffects.com/tremolo.php
Has tap, accents on different beats (including 5 and 7 beat rhythms.. pretty interesting). It has a ramp (leslie simulator), different waveform selectors..
Check it out.