Sparkling on a screen is a very common issue with cheap screens, and something that really should be grounds for you to immediately return it. My understanding with the Elite screens is that this is not an issue on their standard material. I have not heard much negative really about that material.
I think it's a complete waste to get any non-tensioned electric screen and I would recommend a better manual screen any day over a cheap electric, but that's up to you.
Get a 1.0 neutral gain screen in white.
So, I would recommend this over ANY non-tensioned electric screen:
https://shop.elitescreens.com/store/p8/Manual-B-Series
For $235 or so, it's half the budget and will be IDENTICAL in performance. Only difference is that YOU have to raise and lower it instead of using a remote control.
Otherwise, I would get a high quality tab-tensioned motorized screen.
From this page:
https://shop.elitescreens.com/store/c18/Electric-Screens-Wall-Ceiling-Tab-Tension
A 135" tab-tensioned model with the 1.0 white material is about $1,060. IMO, that's what you SHOULD get if you want a screen which should last you 10+ years without headaches.
https://shop.elitescreens.com/store/p26/CineTension-2-Series
There are better models with bigger rollers that have even greater lifetimes on the Elite website as well as from companies like Draper, DaLite and others.