I dunno why I never responded to this thread, since I remember it.
I've made 100 or so carbidized titanium blades, for myself and another maker of specialized outdoor equipment, we both cater to the ultralight, custom, pro/semi-pro segment of the market.
I've been obsessed with these things for a few years now. My own testing and field reports from users has given me what I feel is a very clear picture of the advantages and disadvantages of these tools.
Fwiw I have a larger industrial electro spark depositer (carbidizer), built by Electro Arc Corp, which builds a competative unit to the Rocklin units. Mine is a 10amp, 220V unit the size of a small welder.
Carbidized chisel ground ti blades do exceptionally well at certain tasks, and fail at others. They're not a substitute for steel in any impact task (chopping) or push cutting or batoning type use. They don't stand up to abuse of that type and don't scale well into large format blades or tools. They do excell at slicing tasks, cutting rope, cord, composites, cardboard, and many things that will dull even the best steel edge post-haste. Even things like spectra/dyneema which will absolutely rape a steel edge won't slow it down.
If properly done, maintenance is practically zero, and durability is what you expect from titanium. The self sharpening phenomenon is very effective. Cutting cardboard only hones the edge, doesn't dull it.
The edge is microserrated so in situations where cutting with that type of edge is advantageous, the carbized ti edge is great, but it's not like a fine steel edge at all. You'll never shave with it.
For most normal knife users, there is little advantage to this type of blade, although I carry one of my little "field scapels" as a edc utility. It never has to be maintained or sharpened, so for all the little daily tasks it's awesome, and for my market, where backpackers, adventure racers, climbers, guides, etc, count their weight to the gram, being able to have the utlity of a small fixed blade, without the maintenance, that can weigh as little as 9 grams, is aa huge boon. Especially when many of them don't usually carry knives at all, or maybe only a razor blade.