Bought 4 and planning to buy 1 more so they definitely have more pros than cons. They hold bikes well, are strong and fold down to a compact size. which facilitates their transport if necessary. The only drawback: On our normal garage floor, the blocks can slip when the bike is put down, which usually means that the side arms of the blocks try to fold in. It's not enough for the bikes to tip over, but it reduces safety somewhat. This is because there are no gripping tips on the central structure, allowing it to move when loaded relative to the arms, which have gripping tips on the ends. The central element moves forward while the arms rotate around the grippy attachments. My 10 and 12 year olds are frustrated. Adding a locking pawl would help and would probably prevent slipping entirely. I can't remember if the legs were held in place with screws or rivets, but swapping the short and long legs could provide room for a small person to step in to prevent forward movement.
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