175 F is definitely on the cool side. Recommended is between 195 to 205 F. With too low a temp the risk is under extracted coffee.OK, well both machines came. I tried the Casabrews. Actually impressed with the build quality. Very solid. There are things I have to learn about/understand. For one thing it comes only with pressurized baskets. IDK anything about them. Supposedly better using non pressurized if you grind your own. The portafilter has a little groove cut in where a little "dimple" fits in to lock it in. IDK if this is standard or not. My SIL says his Breville presses in, and he has to pry it out. Mine slips in and you rotate. You rotate again to line up groove and it slips out.
I ordered a standard one non pressurized. Cheap enough if it doesn't work I don't care. Then I may send the unit back and go to the KA unit. Which uses 58mm and has both pressurized and non pressurized depending on need.
I did try a quick double shot brew. It did a very nice job. lots of crema on it. I goofed around a little with the steam wand. That thing is crazy powerful. That will take some practice. Then once you use it you have to flush quite a bit of water through the boiler to cool it down.
One other thing I am unsure of is it seems to brew quite a bit cooler than a drip machine. Water/coffee in the cup about 175. Normal?
The slip in and rotate on Breville is the typical portafilter mechanism. Stronger mechanical linkage for 9 bar plus of pressure environment.
I have never used a pressurized filter basket but also understand they wouldn’t be the first choice. I have read they can help if you have some less than fresh coffee you are using.
Good luck and enjoy. Sounds like first outcomes were pretty good