Seems that I have to add some words why I favour the resistor solution - I want to realize an alternative board which is always madeable without the need for special ICs which are rarely available or hard to get in low quantities.
Remember how difficult (and/or expensive) it is to get special parts -
Maybe not in your country if you’ve the luck that a national distributor offers the chip…
Maybe not for people who are ordering electronic stuff once or twice a month so that shipping costs don’t matter…
Maybe not if you are doing batch orders…
Maybe not for people who order a small number of samples (who knows how long this will be accepted by the manufacturers, I already got complaints…)
But whats about the people who just want to play a little with analog outputs *immediately* and without much costs?
And what should happen once the chips, which have been suggested in the last months, are discontinued?
And where did you lost your DIY spirit? 
Ok, seriously: this is a very generic solution which won’t require any change in the application code if somebody wants to connect a DAC with parallel interface (which are mostly cheaper and easier to get than DAC with serial interface).
So long the device isn’t laser-trimmed, the output voltage of the resistor ladder can be more adequate, especially if hand-selected resistors are used. The output voltage is not limited (you need balanced or high voltage outputs? No limitation here).
7-bit resolution is mostly sufficient so long the output is controlled by MIDI notes, velocity, CCs, after touch, etc. — higher resolutions become interesting with frequency or filter sweeps, but they are mostly so fast that a gain or offset error cannot be regognized.
If somebody wants to have a high-quality solution, he can spent more effort in selecting the resistors, he can still use the MAX525 design, he can choose another DAC and adapt the software driver, or he can connect a lasertrimmed integrated DAC with parallel interface
Ok, these are my motiviations 
Best Regards, Thorsten.
