Ive really been enjoying the game so far through the web UI, and was anxiously awaiting the iPhone client so I could easily keep tabs on my empire anywhere. Personally Id advise you to get the full experience by playing on the web first, but Im sure the iPhone client will get updated as quickly as Apple allows to maintain feature parity with the web version.
Give the game a go! Theres no reason not to at least try it.
BenSS about The Lacuna Expanse