How good are parabolic rollers

I currently use Taxc rollers but still find I look at the front roller for positioning all the time rather than run the risk of coming off the sides. How good are parabolic rollers at keeping the bike from coming off and is there a problem when/if the bike comes up to the raised end in terms of it tending to tip the bike at an angle ( I presume not but thought I'd ask). Also any good value ones - I've looked at Elite Ghibli in particular.
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