Hi & Welcome to the forum,
I fought against Lg. Arbor reels from when they were introduced until a year ago. On a traditional fly rod; glass, graphite, or bamboo, I absolutely love old school reels that remind me of where I came from but............... On Spey rods (I have some heavy line rods) you need to be able to accommodate a big fat line that can run to 150' in length. My first LA was a vintage Orvis Vortex 11/12 and that baby will hold a RIO Mid Spey 11/12 line (875 grains) and plenty of backing so I converted at that point. Since then I was able to buy another original (made in USA) Vortex in size 9/10 in unused condition at a great price and scoffed it up for a slightly lighter rod. So.... I'm now owning 2 LA reels and going to buy a third.
Here's why I need another, I have a 1981 Hardy 13' 9" graphite Spey rod that I love. I've been struggling with an Ian Gordon 700 grain with a 75' belly for this whole year. The line is just too light, but it fits my old Hardy Cascapedia just right. Because I felt the rod was not knocking out the line the way it should I e-mailed the Carron Line Co. in the UK. I figured that they would know how to line a Hardy of this vintage and they pointed me to a Jetstream 10/11 and I bought one. The problem arose when I found that this big fat 130' line was not gonna fit my reel, no way at all. So, here comes another LA reel for the Hardy.
The moral of all this is that unless you are going to use short heads (28') lines and braided shooting line, you're gonna need a big reel, really big. I'm ordering a Hardy LA in size 11/12 tonight and so I'll have 3 LA's. One other reel that will hold anything you want to load is an Orvis Odyssey IV, I use one of those too and they have huge line capacities. You may get the idea that I like old reels huh, I do. I hope all of that answered some part of what you posted, I was in the mood to type
[Edit] I should mention that all my reel acquisitions are usually based on the reel having weight and are not guided by how 'light' they are. Especially for the big 2 hand rods weight is important to me. The reel I am getting now weighs only 8.65 ounces and I'm wondering if it will be heavy enough to balance the big rod I'll want to use it with.