I havent try Shu Uemura's b4. But i've tried many others. Cheap or expensive. Manual or Electronic.

1) Electronic is out of the question. The battery run out too soon. Only gives 20% curl.
2) I've cheap ones also RM5.90. This is scary. It cut off my lashes.
3) I also owns The Body Shop's, RMK's, The Makeup Store. Results are almost same.

Cos i have very stubborn lashes. Most mascara wont work for me cos of the stiff-ness of my lashes.
But there is a way to get super curl lashes. When u curl u start with the deepest u can, hold it longer. Count up to 7-8.
Then move it out a bit and curl a few more seconds. slowly move out a bit more and repeat.
U will see a different. Well, at least it works for me.

Just my 2 cents.