I have not had a problem with my Tekin RS Pro and it's be superb. Having said that if I was to purchase another speed controller I would go for the Speed Passion route. My only complaint with my Tekin is that it ran hot with the Losi 7.5 motor in my Cat SX at our club. However with my LRP X11 6.5 nice and cool (soon to be the 6.5 V3 I won at Petit yesterday (not my driving the raffle!
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I'm planning on getting slower motor for the season ahead to work on my driving as I was terrible at Petit.
i think the Speed Passion is slightly cheaper than the Tekin too..
Haven't decided what I'm doing with my cars yet so may change to a Speed Passion this year if I ditch the Cat SX and B4. For the Losi XXCR the Tekin is a perfect fit.
The hotwire software is very good and easy to use. Also non of the Losi problems I hear about with regards to flashing the wrong firmware (sorry but any company that writes software that can flash wrong firmware onto hardware needs to be shot!)