Safelight is known to use thin and optically "imperfect" products. Stay away from.
Also the OE trim can cost about $300 regardless of the windshield installed. It may or may not break when removed. There are also some sort of spacer clips/retainers that (I believe) position the windshield correctly and hold it above the body as the mastic/glue dries. Yes, the windshield is glued in.
When I had a OE windhshield installed the installer made a big deal of the clips and they did reuse the moldings. MY BMW dealer, with a body shop, has specific installers they use. I doubt if the local dealer does the windshileds themselves.
Thanks,
1995 525i Auto, M50TU 2.5L, EAT chip, 1/95 build, USA, 205/65/15 tires, ASC+T, HID, lumbar, EC Mirror, BMW Alpine 5 radio with BMW-Pioneer CD Changer, abt 236k miles, Oxford Green/Parchment