After the Tena Slip Maxi got discontinued, I had to find a new everyday diaper. For me, it came down to XP Medical Absorbency plus, the Northshore Supremes, and the iD Slips. It was very close between the Northshores and the iD's, but I ultimately chose the iD's because I thought the fit was marginally better. With that being said, they do have some drawbacks: I wish the padding came up a little higher in the front, a little more SAP, and I would like elastic waistbands. I also prefer a diaper with a landing zone. Even so, they are a great diaper. You are right, they can be a little bulky. I don't mind the extra padding, but I just can't seem to find a way to tape them in a way that keeps the padding tight against my body. This is probably due in part to the lack of waistbands.
I feel like I'm nitpicking, as the I consider the iD's a premium diaper. But when you've tried as many diapers as I have and have worn for quite sometime you will discover that the smallest things can you make you like or dislike a diaper. For now, I'll stick with the iD's because they're the best you can get for a decent price point. On a related note, Bambino Diapers just announced they carry the new Tena Active Slip Maxi (Tena's replacement for the Tena Slip Maxi); however at this point it is cost prohibitive at $1.75 per diaper if ordered by the case. It is a good diaper, but it simply doesn't have the absorbency for the price.