The plastic fittings I originally was unsure about once realized they weren’t metal. However, after removing the first metal T from a bidet it was replacing I soon realized plastic may actually be better. Along one of the sides near lower threshold thread had a worn spot. This actually looks to be rust and is leaving deposits which likely would have either ended up in the bidet, back of the toilet or caused a leak since it was on the inlet side. Good thing I looked at it and replaced it.
Now, about quality. Got these seat/bidets all in 1 for about the same price as a cheap attachment bidet which kind of worries me. I’ve bought some great products on the cheap before so hopefully that will apply to this product as well. 
Finished product
The great thing about this design it took me roughly 30-40 minutes to read instructions as instructed and installation. The second one only took 10-20 minutes to remove and install the all in one bidet. So far I like it over the previous seats with separate bidet attachment; which no matter how tight you had them anchored would some how still move. Probably due to the lack of dieting over the last few years. Anyways these don’t seem to be moving and so far are staying put. Its only been 6 hours so ask me in 6 months I might have a different perspective.
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