I'm sticking with Running Springs.
Don't let the price fool you. (Especially when comparing to bloated stuff like Tripoint.)
Given that every single internal part is made in house by one of the most internationally well respected manufacturers of extreme quality coils/transformers/and capacitors. AND given that they reserve their absolute best designs of these parts for themselves. AND given that the company uses a relatively low margin. (read: fair pricing, not bloated, "I'm king of the hill" pricing.)
You're getting more than $35,000 dollars worth of performance from RSA.
Oh, and doing it longer? Well, let me put it this way.....
My high school science teacher may have spent 20 years working on some cool project. But if I need it to work properly, I'm going with the Physicist whose wall is covered with peer granted credentials and awards.
Look up the article than ran in TAS last year regarding the RSA Dmitri. You'll see there really isn't a more qualified outfit than RTI Electronics to build isolation devices.
Dems the facts Ma'am.