[Kevan]

Yeah, the wheels on that 917L was like being hit in the eye by a midgey when riding your bike 

[Gordon Steadman]

Hard to regret spending less than £20 on two relatively pristine cars, but the tyres are so hard they barely move and I can't find replacements.

You should be able to find something here. France though.
Positil tyres

[Kevan]

Just noticed the 917LH sadly also has the rear 'wheelarch treatment'

[Gordon Steadman]

Just got the McLaren out of the box and the gears have gone as well. Just not up to the NSR Shark 21 I put in it

[Anthony B]

gordon - mus have been a verl late friday afternoon car

[Gordon Steadman]

After all the glowing reviews Anthony, I rather thought that myself. I got it from a Spanish shop who went very quiet when I tried to contact them.

[dvd3500]

My biggest regrets are buying rare cars that were broken or missing parts hoping to be able to "fix" them then seeing a more or less complete car for a decent price.
There is a rare Porsche 924 1/32 scale GAMA car that uses a propriety pick up system (the car basically hook in the slot). I bought one that had been converted to the Carrera "Universal" 3-rail system hoping to covert it to regular 2-rail.

And of course less than a year later the car shows up already converted for less than what the conversion cost would have run...

Or the Scalextric TR4 with a chunk missing from a fender or the Prefo Melkus RS1000 that had also been converted to the Universal 3-rail....

I should have just sat and waited for the right car to come along...

[Kevan]

Regrets...yes all those early cars I 'improved' that ended up in the parts bin after a year or so because the improvements didn't work as hoped and they're too far gone to convert back to stock.

[Johnno]

Nonoslot F1 cars

I brought five of these F1 metal chassis slot cars for track cars on recommendation from another person who has these. 

Well what an absolute POS this brand, product and all service. The chassis are simply badly designed and manufactured, the front axle doesn't even utilise any sort of bearing, slide a bit of tuve through a V support and that's it...

The cars rattle and misbehave on the track every opportunity they are given. I've changed the tyres, added weight, I've done what I am able to do with such a limiting chassis and in general product and product design. 

The cars have been in their boxes four weeks after I bought them, having never breated fresh oxygen since. Totally regret buying this brand and product. 

Avoid Nonoslot products at all costs, nothing good comes from the brand sadly.

[Kevan]

and they're not cheap either