I "was" a Meguiars user for at least 10 years. I used the Medallion line as well as their Professional Products line with great results.
About 18 months ago I visited theAdams website and ordered a few of their products just to try....All I can say is WOW!!! There is a noticeable difference, IMO, between Adams and Meguiars. The ease of use is apparent from the start and the shine is absolutely amazing.
I've been detailing cars for 40 years or more and have used nearly every product out there, some no longer exist. For the time being Adams is my finish protection product of choice until something better comes along. Give them a try as I did, you won't regret it..