Yes. Very much this. Spend as much time and money on ensuring you meet the basic minimums your customers expect as you do on innovation. Do this on a *ongoing* basis. Revisit what you've already build. Spend money on building it again, better.
This is a tool that will take traffic that's hitting your live server, and replay it against other environments – effectively conducting as-live testing against other systems. This could be very useful indeed.
Quite tempted by one of these – a bit bigger than I like my wallet to be, but I like the idea of being able to keep a Field Notes notebook in there without it getting dog eared.