I've built stingray preamps and found tant vs electrolytic difference was noticeable.He touts the buffer stage as being audiophile quality, and being the defining characteristic of the pedal, with the freq boosters added in for convenience. I don't have the frame of reference to make that judgement call, but I can tell you he wasn't happy about the "noisy" metal film resistors and "bargain" electrolytic caps I used... which was somewhat intentional. I used low ESR electrolytics instead of tantalums because I forgot I had the tants on hand. Also I'm not sure the normal ear can really tell the difference.
so if the design is so so special and dependent on the cap type used and resistors - you've built a different pedal... with added metal film resistors for increased harmonics or something. As long as you use the "similar too" or "compare too" and are careful how you use the name of the thing (and I wouldn't use the company name) I really don't get what his problem is. It's not like the kinda person who would buy the original would want a Skeptical, the customer bases don't overlap - also - key difference I hear, the big version doesn't use the same high quality nylon white "tone" washer you have.....
and to be honest with you there's quite a few pedals I'ld go and buy the original without hearing it - just because people in the DIY space rave about it.
The skeptical sounded like a high headroom buffer with a higher-than-you-would-expect-input-impedance ...