considering to get all those sounds from other boxes you'd be spending probably twice as much, and they're all in one compact box it's pretty fair.
I personally wouldn't spring for an El Cap or Blue Sky at $300 a piece, but i'd gladly pay $150 for a great sounding tremolo with tap tempo capability, and i'd also gladly pay $150 for a killer sounding reverb- when it's all said and done you're paying about $50 per trem/reverb type, which really isn't that bad
As others have said, $300 is the price point for other Strymons (other than the OB.1 and Timeline), and you get a great trem (that does 3 different sounds) and a great reverb (that also has 3 great modes), for $300, it really is a pretty good deal. It has been pretty much permanently planted to my board. I like that it is versatile enough to get a lot of different sounds but not so versatile that it is complicated to work or requires a ton of tweaking to get a good sound.