I've got a lot of GPCB, 'cause Barry always has sales and I'm a sucker for sales.
As spi noted, the circuits often contain some tweaks, such as reversing the order of a cap and resistor (thus turning a HPF into an LPF or vice versa. It was a bit off-putting at first, but now that I'm aware of this propensity, I keep an eye out for it and then just stick to the original circuit an put a resistor where a cap "should" go (according to the GPCB build doc) and a cap where the resistor was to be — or not, if I like the tweak.
Some of the GPCB tweaked variants are pretty cool, such as adding a boost to the Red Llama or Honey Bee. The Muff board is great for mods, and the utility boards as mentioned — I really like the 2knobjob and the Afterblaster has been a useful addition for a number of circuits that are known to struggle to achieve unity volume. The Double Shot is another boost I really like, 2 levels of boost.
For some circuits, I prefer this-or-that PCB-vendor and for other circuits vendor-X has a cool take on circuit A, while vendor-Z offers a really accurate version of classic-circuit B; some PCBs fit 1590A, other PCBs of the same circuit require a 1590BB...
I get whatever PCB best suits my build idea/plan.
The community here is great, the forum software is appealing, the project selection is vast and ever-growing, and I appreciate Mr PedalPCB's hosting the forum and efforts in accommodating the needs and suggestions of his customers.
Ok, it's 4am, enough rambling from me, a sure sign sleep is required...