I used the Era L4 SB for 6 weeks continuously until a fortnight ago. The YMMV caveat of course applies, but if push came to shove, I could probably use this razor and no other. It coped with opposite ends of the growth scale i.e. daily shaving and 4 days of wiry stubble, admirably. Efficient, but comfortable to use and it only bites if you make it. Whilst the Era could potentially be viewed as 'industrial' in terms of looks, don't let that put you off. Likewise shipping direct from the US, whilst not ideal, is relatively pain free.
Whilst there may be a little bias as I lean towards DE blades at the sharper end of the scale, the Era doesn't appear to be blade sensitive as all of the following performed as expected:
- Personna Lab Blue - USA
- Kai - Japan
- NOS Gillette Super Silver - UK
- NOS Wilkinson Sword 'New' - UK
- Gillette Minora Stainless - Russia
- Gillette Super Bue - China
- Elios (Lord) - Egypt
For reference my main go to razors before acquiring the Era were the Karve C SB and Gamechanger .84 SB