I recently got an Athlon Argos BTR 6-24x50mm for the Tikka T3X UPR .308 that I also ordered. Because I ordered the rifle, a ton of accessories, some extra ammo, etc. all at the same time, (and having just dealt with Christmas...) - I had very little to spend and decided that the ~$300 for that Athlon and ~$100 rings - adding up to just about my limit after everything else- would be the best I could do.
I am both very happy and juuuuuuust a little disappointed with the Athlon. I should say- I got a Gen 1, despite it being advertised as Gen 2. As I understand it, there are a few differences ... the Gen 2 apparently comes with a physical zero-stop out of the box. My Gen 1 comes with a package of rubber washers/gaskets which you can use to install inside the turret to give you a zero-stop. No big deal IMHO. However, I read a few people say they thought the Gen 2 came with less-good glass (either a different type, different manufacturer or slightly different quality level, I don't know) - I can't say that for sure. I will say this though:
As far as "features" - it's *extremely hard for me to believe* you can find anything like it for $300. I know people have loved Vortex for some time but this is just spec'ed out to be a $1000+ "sniper rifle scope" for $300 bucks. $289.99 sometimes I've seen it. Hard to beat. The aluminum used in the construction is some of the best you'll see in optical scope building and it's a rock-solid optic.
I am a little disappointed with the glass at high magnification, and that is something I see over and over about it. I had read about the Athlon, ordered it, and then started reading the high-magnification problems. Multiple posts about the exact same thing on this very forum and others. And it's the truth. Basically it's perfect at 6x, and up 12x-16x is pretty great ... but 18x is about the best I can do, once I get above it , I'm not in love. And it sucks because - I'm zeroing at 100 yards with a reactive green/yellow target, and at 24x I can barely see the hits because of blurriness or haziness, however you want to call it. Almost certainly due to the fact that it's their entry-level glass. I guess you don't get the next step up in quality until their Midas level, which they call "HD Glass" - but they're double the price @ $530 for the low-power optics and $600 for the high-power ones ... so double in price. But I read many people complain about the high-power haziness, and I have to agree. Some people wouldn't care at all- I just hate the idea of saying to myself, "You have something theoretically capable of 100% power, but can only use it up to 75% max..." and it ate at me.
I wound up just ordering an amazing Brownell's MPO and I could not be happier. I am really, really liking the MPO.
Not a fair comparison at all ... we're talking about a $300 budget scope for beginners or people on a budget vs a $1,000 scope designed to compete with $2000+ scopes, so not fair at all comparison.
If you only have a few hundred bucks for a scope, the Argos can be a great choice. If you wanted to upgrade, I would certainly be interested in their HD Glass models. (of course, their Ares and Cronus lines have their best, Extra-Low-Dispersion Glass, sweet.)