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Does Mountain Lion justify its $20 price tag? Yes. Of course it does. If you're an OS X user with a reasonably new piece of hardware, stop what you're doing and upgrade now.

For now, Mountain Lion will stand atop the mountain. It’s solid, polished, and perhaps most importantly, cheap.

Mountain Lion is the next step after Lion. It’s Apple’s current state of the art. If you’re running Lion (or even if you’re a holdout running Snow Leopard), I recommend hopping on board.

It costs $20 and is well worth it ... It hides all the blemishes of Lion and instead it offers up an experience that is contemporary. Mountain Lion is the desktop OS of the moment.

Though it's not a complete system or interface overhaul, Mountain Lion's improved core apps and new features make it well worth the $19.99 price.

OS X Mountain Lion marries some of the best aspects of the iPad with lots of innovative new features to make owning a Mac even more satisfying.

For people who already use iPhones, iPads or iPod touches, many of the new features in Mountain Lion will feel like second nature. ... this operating system’s focus on smart sharing and overall integration with social networks makes it a pleasure to use.

Over all, then, Mountain Lion is a gentle, thoughtful upgrade. All 200 new features? No, not really. But 10 that you’ll use every day? For $20? Yes.

Even at $20, most consumers will not find Mountain Lion worth the upgrade. And it doesn't seem to speed up your Mac. People looking for things like Twitter integration and Cloud storage should get it. Everyone else, you can save your coins.

iCloud is the glue that makes iPhone, iPad and, now with Mountain Lion, Mac, each act as an extension of the same holistic whole. If you love your Mac, OS X Mountain Lion is a no-brainer upgrade.

There is little to complain about here if you are already using OS X Lion, and the £13.99 is well spent -more so if you use an iPhone or an iPod.

This is a tremendously feature-rich upgrade from Apple, one that breathes new life into a 12-year-old OS — and more than makes up for Lion ... Mac OS and the iOS are now joined at the hip in a dozen meaningful ways.

For the price of those cups of coffee, you get a modern operating system, which more than any other right now gives you a continuous computing experience with your phone and tablet.

People have been praising Apple for seamlessly melding hardware, software and services for so long that it’s practically a cliché. But OS X 10.8 makes it feel like a fresh idea all over again–and the more Apple gear you own, the more you’ll get out of it.

If OS X Mountain Lion was a cuddly but unexceptional beast, at this price it would still be worth having. But the truth is it’s a powerful and worthwhile upgrade with lots of nifty features and improvements.

Mountain Lion represents an upgrade that makes it much easier to work seamlessly between Apple devices and simplifies more of the tedious tasks of computer maintenance.

Mountain Lion isn’t billed as a blockbuster release, and it isn’t priced like one. It’s just nicer. And it’s the little things, the attention to detail, that show it best.

Mountain Lion is certainly a worthy upgrade that, whilst it doesn't contain any life-changing upgrades over Lion, makes OS X a more productive operating system than ever before in a value-for-money package.

$20 is a more than fair price for a major OS update that offers as many new features as Mountain Lion.

The collective changes in Mountain Lion are worth the relatively modest $19.99 price to upgrade, though you'll have to wait for some features.