I have used several SUNLU filament types. Mainly because they offer a MasterSpool option. Below are my feelings, perceptions, and experiences with this brand of filament.
Pros: Cost, MasterSpool, Overall ease of use, consistency from roll to roll, good availability.
Cons: Cost, MasterSpool
I placed Cost and MasterSpool in both categories, and here is why... When purchasing single rolls without a spool (I have several printed masterspools already) cost per roll is about $10 higher than purchasing on spool. Also I can purchase a two-pack of MasterSpool (1 masterspool and 1 refill) for about $15 less than the same two refill spools.
PLA: very nice all-around material. Consistent settings between spools and batches. No real surprises, it just plain works.
SPLA: PETG-like is what they call it. Shiny PLA is accurate also. It is VERY shiny. Settings wise, I find that using PETG settings works best for this, higher nozzle temps, higher bed temps, and slower printing are key. Retractions also take a bit to dial in as this can be VERY stringy material.
PETG: Overall same as SPLA, hot and slow are the keys.
Overall I like this brand of filament, though it does take some adjustment of settings for optimum performance.