Not very outstanding at all. I bought it last year and have used it a total of zero times (whose fault is that, mine, correct, but still, it stings that they have a shitty upgrade policy).
Well $99 for a developer tool is quite some impulse purchase. Can I gently suggest that your upset might be more a case of buyer's remorse than dissatisfaction with their upgrade policy?
If it helps, it does come up on things like MacHeist occasionally, and they have sales once in a while (there's one now, at $79.99, but I've seen it as low as $50).