Working with it had me oddly sentimental. Most of my measurements are 12V or less and not especially precise, so I'll reach for my Saleae before even using a modern scope or DMM much less a beast like the 3458a. But it was simultaneously a swansong for a bygone era of engineering while still proving the old tech can hold its own more than 30 years later. It felt a bit like having a Concorde sitting on my lab bench. Like you said if you open it up you can immediately tell a lot of thought and care went into making these things.