Some having a lot more experience than I have commented on Weril euphoniums in various forums. Those comments were mostly positive and they cemented my decision to try one. Here I write initial impressions about it, but be aware that its the first non-school owned horn I've ever played and I've been away from horns for a long time. I can't comment relative to other specific brands.
I purchased the horn new from http://www.hornguys.com/ ($1,500) because based on comments I'd read, I thought they would take care of me. I stressed that I wanted a horn with good valves, no construction glitches that would affect playing it, and good intonation, but that time and flawless asthetics were a secondary matter. If a horn doesn't meet the standard, they send it back to Weril and the customer never sees it. I think I got what I asked for. They replaced the Weril valve springs with YEP321 springs to improve the action.
The valves all work smoothly. My instructor (a DME) played it and commented that she was pleasantly surprised with it. Intonation was not perfect everywhere, but she commented that the places where it was off a little was typical of many horns. One perhaps unusual intonation feature is that it was a tad flat on G, but lipable, whereas I guess most horns are sharp on G? It doesn't have the soft-attack response of an expensive horn, but I guess that's to be expected; it is pretty stout. The main tuning slide is a bit tight but it does move. I will have that looked at and fixed locally this week. I played it outside and in my barn (I live in a rurual setting) and the sweet sound of it almost stunned me. I guess that's just me being impressed after being away for so long.
The tubing braces are all clean with no soldering or plating flaws around them. The platting is smooth and looks good everywhere except as follows: (1) the bell end-flare on the outside surface has tiny flecks of something on the surface that can be felt but not seen. They are only on the outside of the bell, not the inside, (2) the plating is defective over the end of the mouthpiece shank for about 30 degrees of its circumference (its dark gray in those spots instead of silver). The sellers are aware of it and state that most Weril horns have been coming that way recently. They buffed it smooth and reportedly it shouldn't lead to larger problems. A horn repair guy in the local shop whom I described it to, agreed that it should not propagate, (3) the plating is thin in a tiny place near the bottom cap of one valve. Its not bare there, but it has a slight grayish hue to it, and (4) there's a shallow scrape about 3/8x1/16 in. on the outer edge of the large tubing at the bottom of the horn that looks like it was there before the plating. Some buyers could be pretty upset about that, but to me its not worth the bother of returning it and waiting for another mechanically-good specimen to arrive. The way the local horn repair guy put it, "these horns are built untouched by human hands, so don't expect perfection".
Overall I'm pleased with having a nice-sounding and smooth-working horn to learn on for grand less than a YEP321.
Steve
p.s. - I forgot to say it has a nice case.