User blog comment:Sleeperagent3056/What if Kars ever returned to Earth?/@comment-142.196.39.143-20130505234751/@comment-1739368-20130506014451

The projects for both part 4 and 5 are still presumably ongoing, but each volume takes awhile. Volume 42 was actually finished a week ago, though they're correctly fixing a few errors before full release onto websites.

The Part 5 rescanlations are more of a side project by an awesome fan, so they make take a bit longer.

I couldn't really tell you whether to finish or not, I ended reading duwang awhile back, so the entire part was debately ok since I was expecting low quality thrghout. However, I think the endings may leave less of an impression on someone who had to switch over to something worse, so I wouldn't suggest switching to duwang. I'd probably wait for Part 5 scans at least, but expect very bland characters if you decide to read anyways.