This is the same scope I have on my 10/22 Deluxe. I've never had a problem with the parallax being set for 150 yards. I've killed a ton of squirrel's and rabbits with mine to no avail. I've got adjustable objective Leupold's on my 280 & 22-250. Most of the time they stay set on 100 yards unless I'm really shooting long distance at some type of critter. The price you list for the Monarch is a good price if the scope is new and not a refurb. I paid $159 for mine but it's a refurb model and I haven't had a lick of trouble with it. For a couple of years it was mounted on a 12 gauge slug barrel and it held up just fine.