I still like a Presto pressure cooker
for a lot of reasons, but one of them is that replacement consumables, gaskets and overpressure plugs are very easily available, even (usually) in small-town hardware stores.
Presto does have a newer series with built in quick release, and most of the features of the European pressure cookers. They make stainless steel pressure cookers with aluminum bottoms. However, aluminum cookware doesn't really freak me out.
However, for a pot roast like Veg's above, you want pressure to drop naturally. If you were to quick release a pot roast, it would be an inedible brick.
It is, admittedly, a challenge to wait, when it smells that good.
Again, I will mention Lorna Sass as one of the best writers on pressure cooking. Her "Pressure Perfect" is excellent. There are other writers, like Victoria Wise "The Pressure Cooker Gourmet," and it's a good book, but I just like Lorna's books better.
I am adding the link to Presto's home page.
Lawrence/Maytagbear
Pressure Cookers, Appliances, Parts & Service, Canning Information & Recipes from Presto!
gopresto.com