zeb you mean the two lane ones or the four lane ones?
ive never run on a four lane one but scaley sells inner and outer turns just for those...ive used the inner and outer to make increasing or decreasing radius curves from time to time but never set up a full 4 lane track and right now my and my friends slot racing space is limited so we barely got room for a decent 2 laner.
as for how well they work, well they dont work really at all unless you have two power supplies and rewire the track to use one power supply per lane. not hard to do but if you dont then your car runs x fast with only one car on the track but only half x fast if another is put on the other lane, and it *really* gets exciting when one of the two comes off the track because the remaining one doubles it speed which is all fine and dandy unless youre in the middle of the curve and then its a disaster!
but the great thing about modern home track is that they have steel instead of aluminum rails and that allows you to use magnets for better traction. but that gets old after awhile because you get to the point where you can just hold the trigger down and go full bore all day long without even watching the cars. so we have pretty much ditched the magnets in favor of having to drive; or at the most have a small magnet for just a bit more traction. thats an advantage to open body motors like pittman etc...they have this big honking magnet built into the motor and you hang that thing as low as you can and you have "no magnet" but magnatraction anyway! makes them almost competitive with cans!
another thing is the lap counters and timers that are typically available with the scaley tracks suck. i got a cheap computer and some lap timing software, mounted some photocells in the track and a light overhead (just a high intensity lamp on an arm really...jazzed it up with some banners so it looked more like something at a starting line) and that worked great. the monitor looked like a digital scoreboard. unfortunately we dont have room for that so we are back to no lap counter/timer.
i wish i didnt have so many real cars so i could set up a nice track again in my garage but that aint happening. im thinking about moving to utah next year and if i do im going to buy a house big enough for me and my toys including one room just for a nice track. problem being all my friends will be back in cali including my girlfriend.