More expensive esc's will typically deliver better, smoother acceleration and brakes, and have better feel, more useful and noticable when your racing regularly and reasonably well practiced. They are usually able to better handle the fastest motors as well, like the 4.5t and lower, and typically give you a more robust ESC for racing.
The Losi ones from what I've seen can work perfectly well in competition, but there is some question over reliability and software. The software seems to have improved over time and can be updated via your pc, so it's an ever changing benchmark.
But in the right hands and with some care I get the impression they are perfectly ok, and perform very well on the track if you take a look at some of the results. I'm pretty sure the Losi team drivers are running them and not under performing, so if your system is working ok, then I'm not sure you'll notice a siginificant difference in overall performance?
In general though, I do agree with Fabs, like with everything, you get what you pay for! And each brand/model does feel different, I've never tried a Losi system and have been using novak for all of my racing. About to try out a Tekin now so I'm interested to see how different it feels.
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