Used it. Liked it. Here's why:
First of all, let's give the elephant some space; you do have to rez this before the runner declares a run if you want it to have any effect. That being said, is 6 bits (credits) a good price?
I'd say it all depends on how you use it. On a fort with one piece of ice, bioroid or not, six bits is steep, but if you're playing HB your ice is probably stacked thick. Maybe you have two pieces of ice, a third would cost 2 to install, a fourth, 3. Subtract that from Ruhr's rez cost of six and now we're looking at a more reasonable price, paid for at the timing of your discretion, instead of another piece of ice with an install cost upfront and the rez cost later.
The best Genesis Cycle combo I've found effective is to stick this behind Heimdall 1.0 on a central server, ensuring the runner can't simply click past. (Later, it strengthens 2.0 'roid ice as well, reckon.) As a late game card, if you're Haas-Bioroid: Engineering the Future and you see it too early, you might consider playing this for the credit on a slow turn, rezzing it when it becomes relevant.
Lastly, it's worth noting that it can help to mitigate the use of e3 Feedback Implants.
So when would I actually play this card? Let's imagine a 9 agenda HB deck with two SanSan City Grid and three Biotic Labor. I'm Haas-Bioroid: Engineering the Future and I have 3 Accelerated Beta Test I want to use so the deck is roughly 50% ice, with the remainder filled with economy. That's when I would play this card.