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My husband and I have something very similar to this: [link]
Though the 3-5 lb roasts you ask about would likely be best suited to the 6 quart version, if you don't enjoy leftovers or freezing your leftovers, the 6 quart may be too large for your needs.
I'd recommend this one, because it takes care of needing multiple crockpots at once instead of having to spend money on so many, but also is not digital and, well, I've just had good experiences with it.
No, but we have one of the Hamilton Beach ones that comes with three crocks of varying sizes, so if I broke a crock I would probably just use one of the other ones. BTW, I recommend this model.
We have a Hamilton Beach 3-in-1 Slow Cooker and it seems to work well. The one we have is actually a different model with 3 different color inserts and painted sides, but other than the cosmetic differences it's probably the same.
Pluses: 3 sizes (2 qt, 4 qt, 6 qt) so it's easier to ensure you're using the right size for your recipe, or you can store leftovers in one dish while cooking something different in another. only 1 lid though.
Minuses: stoneware dishes just have an enamel/glaze type of coating. durable and not awful to clean, but nowhere near as easy as PTFE/teflon. also not programmable, but I haven't found that to be an issue (for the things I make, the exact cooking time doesn't really matter so I either let things cook all day, or overnight).
edit: one more minus: round inserts rather than oblong mean some cuts of meat don't fit and need to be cut into 2-3 pieces. for the things I make I usually don't care about this, but for some people this is an important concern.