I like the vocalists singing style, but the band's lyrics have a tendency to be vague. Many of songs are very straightforward, but some are lyricized in the manner of someone trying to conceal a hidden moral or commentary through verbosity. Their beats I'm quite fond of. They are as you said, happy and upbeat, but I moreso enjoy the fact that they are focused, melodious and expressive, rather than the mindless, hysteric scrambles of sounds of some of their companions in genre.