I've owned one of them and used both. The 3200, I've owned and the 4200 I've used on two trips that belonged to my brother-in law. The 3200 was mounted on a Browning BAR in 30-06, the 4200 was on a Browning bolt in .270. I could not tell the difference between them. Maybe it was my eyes but we compared the two in the field before the hunt and we could find no difference. Compare the two and decide for yourself if you think the 4200 is worth the extra dough. I didn't think it was.