I've got stage 1's for what I'm doing can't say I really need any more power, the extra power would be used on such a rare occasion I couldn't & can't justify the extra expense. Combined with the fact that i like to keep the smoke to a minimum while daily driving which generally includes quite a bit of very low to zero boost situations I'd rather stick with something that will give me that.
Oh and living in an emissions regulated area it won't surprise me when diesels appear on the emissions check list so I'm planning fo that future reality.