The Alpha pots have a great feel and they're still going strong in guitar amps I built ten years ago. So do they suck? I don't think so. You can buy better pots, but the Alphas represent a good overall value, in my opinion.
Still, considering the cash you've laid out for the other parts of your LA2A project, and the fact that only a couple of pots are required, it might be worth your while to go a little more "upscale." I'm using Alphas for my DIY mixer project, but it has a lot to do with the fact that I need to buy over fifty pots!