As I remeasured a new batch, I figured it was time to post some quick thoughts of this solution after a year (much of it away from this hobby, though):
Sometimes I wish the join between the flex tubing into the stopper was tighter as it flops around, but a bonus of the design is on a new batch (lots of liquid) I can pull much of the pump body out and to the side.
Clear containers really remind you how many impurities are in our fertilizers

In these cases pulling out the syringe some distance from the bottom prevents it from clogging.
I've only had one syringe clog (really at the union between the flex tubing and the syringe) and easily fixed but pumping in and out tap water. Syringe bodies are easy to clean. Small mouthed bottles not easy.
The glass has a nice weight and I've not been tempted to replace.
Have thought about using glass in the out tube just because it would look cooler.
All in all very happy and still think I will use them for years. Everybody who sees it and any ferts make ask/make a half serious meth-lab question/joke, and really, I would too. I think this bonus.
