I have 3 of these and despite the high price tag, I think they're worth it. I wish it was released when my oldest was born, so we didn't have to buy another bed when he grew out of his cot.
We used his old cot for my daughter but soon sold it when these came on the market. Right now, she's using it in the lower mattress position with bars. She's nearly two but is a restless sleeper and she hates climbing, so it's a win win.
When my twins were born we invested in 2 more, however we only use 1 as the twins won't settle unless they sleep together, but seeing as they're identical, I guess they feel more safe. They're 5 months old and are in the same cot setting as my daughter.
I could not be more happy with the product!