I have one in 1/35 and another in 1/72, both by Revell. I haven't built it yet, I just snagged it when Model Expo had the 1/35 scale kit on sale for about $15. The one I have comes with the largest aluminum barrel I have ever seen in 1/35 scale. The dang thing is huge! The plastic barrel that comes with the kit doesn't look bad, but the aluminum one will save a lot of work on the long barrel seams. I picked up the Eduard PE set for mine, but I don't know if it is really required.
I bought mine when there was talk in the air about replacing the cancelled Crusader with the PzHbtz2000. Of course that plan never came to fruition, but I still think it could be a neat "what if".