To me, "Presto" is the same album as "Roll The Bones" but without the added benefit of sure-fire radio-friendly hits. Both were produced by Rupert Hine, and his sparse treble-heavy approach (guitars chime more than cruch, drums click more than thump, bass is audible but muted, synths are present but not overwhelming) defined the sound of both of those albums. But where as RTB contained some instantly catchy tunes like "Dreamline", "Ghost of a Chance" and the title track, the material on "Presto" has to be listened to a few times to fully absorb this new 90's-model Rush. For that reason, it probably appeals to longtime Rush fans more than it's made-for-radio successor (I happen to prefer RTB myself).
Overall, Rush has emphasized melody more with each passing release since their first big mainstream breakthrough "Permanent Waves" back in 1980. This album seems to continue that streak, focusing more on quality songwriting than simply using a song strucutre as a foundation for the intricate multi-time-signature jamming that they've been known for. It's these kinds of shifts in direction that divide fans of Rush old and new, but it's also these shifts that ensure the band will always HAVE fans both old and new, and not just the former.