This is a pretty standard April 1990 Colorado run show with a few highlights. Historical sidenote: The last show Phish played on 4/20 was in 1994; a bit odd given the reference. Despite that, if you are looking for a good, representative show for the April 90 CO run, I'd suggest 4/22/90 because, as @TheEmu mentioned in his review, the audio is less than ideal (especially the first third of the show) and takes away quite a bit from the listening experience.

The Ya Mar is interesting to listen to with the added "napkin pa" lyrics and you can tell that the band is having fun, but the early part of the show is marred by bad audio. Its always a childish treat to hear the old, vulgar lyrics of Cavern. Given its rarity today (2013), the Forbins > Mockingbird is a good listen and has a little narration in between.

The whole second set flows nicely but is played pretty standard for April 1990. For the time period, the Weekapaug Groove is rocking and you can start hearing its development to what it would eventually become in 1994/1995. Given that the "slow" version of Rift was only played a half-dozen times, this Rift is an interesting listen. To my ears, the slow version is jarring and doesn't quite work. A nice YEM closes the set (the second time ever that YEM closed a 2nd set, 3/17/90 being the first) and closes the show.

In a nutshell, its an average show for this time but, for my money, I'd go for 4/22/90 to get an idea of this early 1990 CO run.