Can't comment on tube rolling neither. Well, I had to change a faulty tube after only a few hours, but that happens. No big deal. To be honest, I didn't find that many options for the stock tubes that seemed worth it, so I didn't look any further. Even if the manual says what other type of tubes can be used, I feel somehow safer sticking to the 6n1p and 6n6p, which as I said, don't seem to offer a wide range of options. But I could be wrong and suggestions would be appreciated.
Still loving this amp a lot! But I doubt that I would spend another 600, if I just bought the WA3 (I used to own the WA6SE). Unless you want to compare the amps or you need a 2nd amp anyway or for some other reason. If it were me and cash wouldn't be an issue, I'd rather upgrade to a bigger one from one of these 2 companies instead of 2 entry level ones. Honestly, for what Feliks offers in terms of look, build quality, price, SQ and service, today, I would choose Feliks again anytime. Not that Woo wasn't good, I loved it, but the complete package of Feliks fits my needs more. And living in europe makes it kinda complicated to order from the US anyway.
Doesn't really answer your question, I know...but yes, the Echo is absolutely worth the price imho.