Scopes with logic analyzer inputs often have optional add-on modules that let them decode various serial protocols: SPI, RS-232, I²C, CAN, etc. Tek and Agilent want around US $700 per protocol family for theirs.
My question is, why would I want to buy a software module more expensive than Photoshop to do this when there are many PC-based protocol analyzers on the market at a fraction of that cost, many of which decode multiple protocol families? Are Tek, Agilent, et al just soaking EEs, or do these modules have features you don't get with a US $150-400 PC-based protocol analyzer?