The Helios is a spectacular lens and is only cheap because of the sheer quantity of them made. I've read it's the most mass-produced lens on the planet.
The Helios has famously been modified by multiple groups for modern cinema use. One such conversion is by a company called Dog Schidt Optiks, which modified the Helios to flare as much as possible, to give a very retro vibe. Andrew wrote about it here:
https://www.eoshd.com/lens/digital-goes-back-to-the-70s-1st-impressions-of-dog-schnit-optiks-flare-factory-58-lens-and-sample-photos/
This lens is included in this huge test of 50mm lenses, which includes many of the greatest cine lenses available regardless of price:
You will note that it is very sharp wide open, and has quite pleasing characteristics. It's worth spending a few minutes comparing it to the other great optics (timestamps in the description) to really see how good it is. Of course, it flares like hell, as that's what this variation of the lens is designed to do.
It's also used in the Ironglass set which is a set of professionally rehoused Soviet optics:
https://ironglassadapters.com
I have two of the Helios's - the 44M and a 44-2, which are included in this lens test here:
The lens is a copy of the Carl Zeiss Biotar 58mm but has a dreamier look, which with todays high-resolution cameras, contributes a welcome antidote to the digititis that lovers of cinema recoil from.
This is an interesting article about it if you want more information.. https://www.gearfocus.com/blog/2020/05/helios-44-2-bokeh-king
Don't confuse cheap with low quality! π