Friday evening I was too late to make it to Catalina (they have a mostly day crowd, so close at 9pm), so I decided to give Inversion a go, since I'd heard good things.
Now, I judge coffee shops by their lattes. A passable latte requires some amount of training, care, and craft. If a coffee shop doesn't make a decent latte, they are demonstrating a lack in all three of those departments, at very least.
So the verdict on Inversion: not good. One of the worst lattes I've had, in fact. The milk was WAY too hot, and the espresso had any number of defects, beginning with being watery and bitter. Very disappointing, and really very unfortunate. It's just not that hard to make a decent latte... not a great one, but a decent one. You need to be able to pull a decent shot of espresso. You need clean equipment. You need to understand what you're doing to the milk, and what happens when it gets too hot (i.e. much above 155°). And you need to care.
So I stick to my current belief that Catalina is the only good espresso house in Houston. I've yet to find another (but I'm trying to slowly give the others a fair evaluation).