Those cylindrical boxes changed my builds for sure. Having tons of pipe and a CNC metal lathe, I can know them out quickly. The only issue is mounting the PCB, but if you make it a snug diametrical fit, the likelihood of the parts grounding is mitigated. I've been using the little bud boxes but having to cut a D in the end (and sides for reflection bridges) was a pain and I never had the right size. Now looking at the cylindrical boxes, I can use even metal pipe for more shielding and I picked up a ton of end cap sized cutoffs for free a while back. Also, being cylindrical, they give a better look to in-line filters, etc.