I have 3 spotters now, Swaro ATS 80mm, Swaro STM 65mm, and a Nikon ED50. I bought the Nikon first and used it for everything until I could afford better. It still plays a role in my hunting, usually for elk. I have a little cheap light Slikk Compact II tripod and the ED50 that weigh about 1lb each. It's not as nice as the better, heavier, set-ups for long glassing sessions but seems to be just enough to check the bull out and see if he's broken that I find with my binos. If I plan to spend a lot of time glassing my pack usually has the STM65 and the Outdoorsmans compact medium tripod with their pan head, plus an adapter for my binos. I also pack the Outdoorsmans V shooting rest so my tripod is also my shooting platform. If I'm just needing to evaluate larger antlers like an elk's for broken tines and judging size though the little 50mm scope and light tripod can cut weight. They total up to 37oz. The STM65, Swaro soft case, Outdoorsmans pan head, and tripod weigh 5.9lbs. Depending on what and how I'm hunting the little one can save a lot of weight.
The 80mm spotter mainly gets used scouting or from a window mount. The 65mm gets used for antelope, muleys, and often whitetail. The 50mm gets used for elk. Hope this helps.