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Heptylene
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Schott-Duran all the way! Also Ilmabor and Lenz are good brands from germany. Never had problems with any of them.
I tend to buy my glassware new for components that are critical, like RBFs, beakers, condenser. Anything I never want to break on me during a
synthesis.
For glassware I use rarely, I buy from deschem. They are ok quality, but the joints are not as good as Duran joints.
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Fyndium
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So you say that Chemland glassware is good?
A flask that costs 25€ costs 50€ from China, and many other flasks are much cheaper as well. When something looks too cheap, I always suspect it.
The chinese flask measurement markings have been surprisingly accurate. I took a test with measuring cylinder and most were very close. The volume of
the vessels can vary though, usually upwards, but this phenomenon seems to occur with brand too. Schott Duran 2L separator can take at least 2.5L.
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Texium
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Sep funnels are generally supposed to hold more than their declared volume, so that you still have room to shake. 
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Fyndium
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Well, that makes great sense. On the other hand, it seems that they could always be just a little bit bigger.
I'm again in the adapter business. Chemland has 29, 35 and 45 joints, while all Chinese go with 24. Only actual downside with them is that they
increase device height.
For erlenmeyers, it seems that 45/40 joints can be good actually, because they allow better access to contents than a tiny 24* hole. I had to do a
recrystallization of a chunky crunchy stuff and it was a job of it's own to make the pieces small enough to fit in. I still haven't learn to use
beakers.
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pneumatician
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Mood: ■■■■■■■■■■ INRI ■■■■■■■■■■ ** Igne Natura Renovatur Integra **
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Ilmabor are I think the "qlty control NOT passed" from Schott-Duran or some other big guy like this. I have some Ilmabor items and the "quality" is a
joke. I have an erlemmeier with good appearance but if I look at the base it has most of its glass diameter much thinner!
Of course I never buy more from this brand. Simax is very good and hard. I love the labwareGlass "DDR" with his look "sting punk" :-)
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Bezaleel
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Fun, I seem to be the only one so far in this thread who had had an issue with Simax glassware. Two flasks has air inclusions in the glass, and so I
lost my trust in Simax's quality. I still buy it though, or price reasons, but prefer Duran Schott (or old Jenaer).
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Fyndium
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My Simax flask also has air bubble in the bottom.
My Schott Duran flask - at least one of them - has air bubble included as well.
So I see that air bubbles, at least in singular occurrences, do not cause flask QC fail.
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