Just my 2 cents but if you really want to up your espresso experience I'd look at upgrading your grinder first. You can do a lot better than a K-3 and it really does make a difference in the cup, why everyone always says GRINDER FIRST :)
The PID will probably die one day, if you lucky the Hahn 12V onboard transformers will die before the display. On the early models the Hahn transformer is only rated to 75C, and I personally feel the voltage delivery is a little high for the board. If the PID dies, you will see the transformer bulging or split on the PID board. Unsolder it from the board, solder some bell wire back into the transformer connections and off board the transformer. Replace with a 12V transformer from Radioshack and mount it above the pump (you need to ensure the bell wire is long enough for that. Put a 50 ohm resistor in series to drop the voltage a tad. This will usually fix a dead PID and prevent further problems in future. A machine I fixed like this more than 3 years ago still functions fine today. The fix costs a few bucks.
Im not gonna repost this 9just link to it) but if you havn't done so, check your pump. I have more advice, but want to write it up with photos first.
I guess I need to update my profile. I now have a mahlkonig k30 vario. I am very pleased with the results. I noticed a big difference in the espresso results vs the k30. It is probably overkill for just my own personal use, but hey it does a great job. I also got it for a fair price.
My PiD already died 9 months ago. I ended up getting the upgraded red PID. Jason @ CCS said that this PID was a little bit more heavy duty than the original Blue PID. So far so good. I will check out the link.
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