I still have a dealer acct with a few wholesalers as I was running a shop at one time. My main dealer in the US sells a LOT of those Wassell unit and I believe made in eastern Europe. I am told they are good units and correct, much cheaper than the Boyer. I ordered 3 sets last time I ordered ignitions on recomendations of staff at the wholesaler and I have not personally installed one yet (Soon) But the 2 units I sold to friends said no problems and are happy with those units.
I think the cost is about $30 USD less than a Boyer.. I have had good luck with Boyers but the older units ARE voltage sensitive, but overall cant complain. 99% of problems are owner induced not the ignition.
I wont run stock points on a Brit bike,, EI or nothing. On a older maggie bike?? Thats different,, but even then I am a fan of converting to a EI.
You can now buy maggie blank housings that will fit a boyer or other EI unit and swap them into a early maggie bike, the only issue is 12v and good supply of power. The boyer power boxs are highly endorsed by many for 12v generator bikes. Not cheap but good reports. I have one here new in the box and will install at some point but that will be the first time I used one. But I hear good things about them and based on real world experience of people I trust I purchased one.