"Baby wants a new pair of shoes"
I like the way my Marx passenger cars don't have much car light flashing to speak of; they have near "constant lighting" quality. With only one shoe too. Every passenger car I have blinks constantly except the Max and they have rollers while Marx has shoes.. some cars even have dual pick ups, still not as stable.
The shoe, even homade on a couple of cars, has a more reliable connection IME, but alas they do wear faster, have a way more drag, and some turnouts and uncoupling tracks give them issues too.
I think the drag was the main reason for going to rollers, not a connection issue. Singly, not a real issue, but it can be significant when you have many cars each dragging a tiny anchor. I figure about 1 car less ability for every 4-6 shoes.
But even homemade, I find them far more reliable than the modern plastic cradle insert type rollers. The plastic lever springs are weak and break, the stay tabs give, and they melt too easy when there is a heavy amp draw too. I must have replaced a dozen plasics since the indroduction and have 3 or four bad now..... Ive only replaced two PW rollers ever, and they seem to perform better, likely more spring pressure at the roller because the platic cradle has to fit lite weight cars and plastic trucks as well.