. We don't know how good TGMO is other than it's a very light grade 0w20 for Toyota engines. That signifies some level of quality, but anything else beyond that in terms of how good it is, is unknown.
according to uoa's on bitog it is a good light grade 0W-20 demonstrating excellent shear stability under normal use, with very good additive retention results in these uoa's. this speaks about quality in all aspects.
If this is true then the TGMO 0w-20 is an excellent engine oil!
For a deeper quality assessment though someone independent should test this TGMO under short trip driving conditions for extended period and mileage use.