Mathmos still good/Lava Lite better quality now?

[Kitsuku Mitsumatski]

I have picked up some near brand new lava lite lava lamps (Made at the end of last year) and while I wanted Mathmos I needed something for now till I could get a hold of a Mathmos Astro or such. Surprisingly though it seems the flow is pretty good int he Lava Lite lamps I got and as far as looking at Mathmos videos online is very similar.. 

So my question is have Lava Lite's improved lately or has Mathmos quality gone down recently?

[Marcel]

Both companies had to change formula over time, as some ingredients are forbidden now. 
its all started with PCB inside, went over perc and now something similar but not forbidden. 

[Aaron Rodgers]

So I'm new to the hobby here, but inherited about 10 lamps and have added 5 newer lamps of mfg in the past year or so. I got 3 14.5 inch of which only one was cloudy. One 27" which is a little cloudy but still in it's first month of service here. And two 16.3". One of which is cloudy. I don't see them as all that bad personally. The others bubble a bit more, but the newer seem to just be a bit more stretchy. Perspective in my opinion anyways