Lots of people with HEL lines fitted and no problems on here. If you fit them properly then there is nothing to worry about. Customer service with HEL was brilliant for me, I had a line rub on my tyre (entirely my fault, I didn't route it properly and it moved) and emailed them asking if I could buy a single line rather than a full kit, and they sent me out a full set straight away, completely free of change
All kits available replace the same part (the flexy part after the hard lines) some just route differently. The HEL is 4 lines as you've noted, very easy to fit just remember to bleed them in the proper order (and don't forget there is two bleed nipples per calliper) and use a good brake fluid.