I'm not saying it's rocket science but it's a little complicated with drilling the holes and making sure you get every single crevice.
Is it the same or better? Beats me but you're experience isn't exactly representative of an entire company or it's products.
AFAIK, something is better than nothing and if you're considering Krown or Rust Check, I'm sure either is fine. I chose RC because the guy down here that does has a bullet proof reputation. Luxe Auto on Vimont in Orleans...
93 325is - sold!
2000 540ia- sold!