What exactly do you mean by "Recreational?" Do you mean sport diving as opposed to technical, because both fall into recreational diving. If it ain't commercial, scientific, military or public safety, it's recreational.
Have to agree with some of Caveseeker's points... The real test of a 'simple' unit aimed at the sport market is going to be whether or not sport agencies (SDI, PADI, SSI, NAUI, et al) sanction training programs...