I've heard that the Eclipse has a lag while switching presets. Has this been improved, or do the Pitch Factor still have an advantage over the rack unit in this respect?

My needs are a dedicated unit for harmonizing guitar leads. I assume that the Pitch Factor has enough processing power to do this, at least with some delay to allow processing, but I'm not sure whether the more advanced converters of the Eclipse would yield a better end result or not. 

The setup I've used for testing is really simple, only my guitar, the Pitch Factor, an amp head and a speaker cabinet. the input/output switches of the Pitch Factor has been set according to how I've connected the gear. I've also adjusted the output level.