"These spacers are a bit smaller than some. That can be handy, if you're using thin tiles - the front-to-back dimension is a tad smaller than the last lot I had which means you have fewer to poke back before grouting. On the other hand it makes them a bit more fiddly. Swings and roundabouts, really. They're nice and cheap, though. Features? Oh yes, packed with exciting features - really, ScrewFix, do you really think we can assign a value to the features of EVERY item? Performance - yes, they space tiles very nicely. Reliability. What silliness is this? It's a tile-spacer. It's like asking me to rate how well a politician opens beer bottles, meaningless."