True. the SSDs make a difference, however in my case, I was disappointed with the Air mainly because of the processor speed. The fastest Air model was slower than my 4-year-old MacBook Pro. Ouch. I did buy the fastest processor at the time though and paid a premium for it, but i had a hard time justifying buy a new laptop, the Air model, that was slower, or at best, the same speed as my MacBook Pro, and I could just replace my MPB drive with a SSD to gain the HD performance increase.
I'm not sure which has a bigger impact on compile times, if doing development, but I would imagine both, as compiling is CPU intensive but if you have a lot of files, then the quicker SSD I would think would also result in less compile times.
Though the portability of the Air is a definite draw, and I may consider if it gets faster, but still not sure if I would pay for that extra slimness as I get more bang for my buck with the MBP (faster cpu, better GPU, ability to change RAM, etc). But the Air is definitely a nice machine.
If I had neither the iPad nor an existing MPB (which I want to upgrade from), then I can see the appeal of the Air to a new buyer a lot more, which is your situation.