Haven't used any myself, although I bought a couple boxes for my hunting buddy for Christmas.
Here are some testimonials from Cabelas. There were 44 of them, with a rating of 4.9 out of 5. You can read them all here:
http://www.cabelas.com/cabelas/en/templates/product/standard-item.jsp?id=0040380216159a&navCount=1&podId=0040380&parentId=cat20839&masterpathid=&navAction=jump&cmCat=MainCatcat20712-cat20839&catalogCode=XG&rid=&parentType=index&indexId=cat20839&hasJS=true#3, .30-30: "At 100 yd.s, the 336 groups about an inch, and the Model 94 maybe just a little more than an inch. Stretching out to 200 yds with the 336 was a breeze, with just over 3 inch group. "
#4,.35 Rem and .444: "The accuracy on the range is quite impressive also."
#5, .45-70: "I produced an 1.5" three round grouping with my gun. Keep in mind, this was with an 18.5" barrel and a 4x scope."
#6, .45-70: "This is some very accurate ammo, last three shots after sighting in was a 1 inch group at 100 yards. these are definetly worth trying."
#8 ,.450 Marlin: "This is some very accurate ammo, last three shots after sighting in was a 1 inch group at 100 yards. these are definetly worth trying."
#9, .30-30 and .45-70: "I've used this in 30-30 and 45/70, both proved to be stunning, giving 1 inch groups at 100 yards. "
#11, .30-30: "The 30-30 leverevolution ammunition I recieved shot just great. The recoil was less than my by-the-book handloads and the groups were smaller (under two inches). "
#18, .35 Rem: "I had 1 inch groups at 100 yds and could consistantly hit the 200 yd and the 300 yd plates using the BDC info on the box. Good product."
#21, .444 and .30-30: [.444] "I can group 10 rds. in 1 1/2"s. [.30-30] I was so pleased I also added one of their 30-30s to my collection and at 200 yd. I can compete whit almost any other weapon out there. "
#23, .30-30: "I can group 10 rds. in 1 1/2"s. I was so pleased I also added one of their 30-30s to my collection and at 200 yd. I can compete whit almost any other weapon out there. "
#25, unknown: "Sub-1" 3- Shot groups at 100 yards! Very accurate for a Big Bore."
#26, .30-30: "The LeverRevolution ammunition reduced the group size to about 1.2 inches and consistently 2.5 inches high @ 100 Yards."
#29, .45-70: "I sighted in at 3" high at 100 yd and I am 2 1/2 " low at 200. My best group was 2 1/2 " at 200 yd. My worst group was 1 3/4 at 100 yd."
#30, .444: "this is the best ammo i have ever used. my groups at 100 yards are touching each other."
#33, .30-30: "Amazing performance and accuracy. At the range my groupings were .75 out of a 20" Marlin at 100 yds. "
#34, 450 Marlin: "Also in preliminary tests that I preformed, this ammo grouped at less than 1.5 inches at 150 yards."
#37, .45-70: "I shot a single group of three that measured 0.9 inches at 100 yards,"
#38, .30-30: "With my 50+ year old 30-30 made by WesternField, I was shooting 1.5" groups.....something I've never come close to doing at 100 yds." "I purchased a Marlin 336XLR. Took it out to the range and it produced a 1.25" 3 shot grouping at 200 yds!"