We have the mini, and moved our daughter out of it at 5 months -- she'd started wanting to roll onto her side, and there just isn't much rolling space in that thing. She's also above the 99th percentile for height and weight, and was starting to wear 12 month clothing at 5 months, fyi.
That said, I left the mini sidecarred to our bed, tucked a pillow into it to make it level with our mattress, and now she starts the night in her crib and comes into our bed later. She sleeps between me and the mini cosleeper, and having it there means (a) she can't roll out of bed and (b) we have a bit more wiggle room, since she sleeps right up at the edge of our mattress with her arm splayed out across the pillow in the cosleeper, if you can picture that. (I know people worry about pillows with cosleeping, but she only ever rolls toward me in bed, so I've decided I'm fine with it, especially now that she's a hardy 8-month-old.)
Just figured I'd let you know about the mini's alternate use as a bed-extender, in case that would help in your situation too. I think it buys us at least an extra 6-8 inches of sleeping space for my husband and me, since our little one prefers the classic arms-out-to-a-T baby spreadeagle pose. With one arm in the cosleeper and the other on me, she doesn't take up nearly as much bed space :)
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