O.K. this is probably too late as you seem to have made a purchase off "the old auction site" but,
Some of the best options in compact porro prism binoculars are the 8 or 10x26 mm Bushnell Legends. I have had the 10x version for a few years and it is really quite a good little binocular. It's not easily carried in a pants pocket but, slips nicely inside a jacket. These can be had for under $100 US.
If you want something more compact then you go for roofs of which there are a couple of good, inexpensive choices. First the Pentax DCF MC II (in either 8 or 10x25) These are very easy to slip into even a front pants pocket and their optics are very good (they are even phase correction coated.) They cost about $130 US. Secondly, there is the 9x25 Bushnell Legend for around $160 US. I don't have a lot of experience with this specific model but the Legend line is well respected and these are waterproof, fogproof, phase-correction coated, etc. The roof prism design will make them more compact then their porro prism sisters.
The Nikon Sportstars you mentioned early on are reportedly pretty good but, their eye relief is so small as to make them unuseable to me. If you also wear eyeglasses, you will likely have the same problem.
As to whether the Leicas are better, the short answer is yes. How much better? That depends on how picky you are about what you see. They will be brighter, clearer, more rugged, lighter, and smaller than these others. They will also have better resolution, greater contrast, and exhibit sharpness closer to the very edges of the field of view. They also will exhibit fewer optical abberations (chromatic abberation, pincushion distortion, barrel distortion, etc.) than these lower priced roof prism specimens. However you may or may not be able to actually see these distortions, especially as a "beginner." (Optically the porro prism models may actually outperform the top-end roofs by a tiny margin but, they are significantly larger and heavier.) Are these high end minis worth a price tag that is close to 5X the cost of some of these other models? Only you can decide.
I counseled my in-laws to buy an inexpensive roof prism compact model when they went on a trip to Hawaii because I knew they were cheap and wouldn't be willing to buy anything better. I also knew that they wouldn't be willing to carry around anything larger. They were thrilled and the Leica wouldn't have enhanced their experience at all. In fact everytime they touched it they would have felt pains of guilt over its pricetag. (By the way, this binocular has sat on a shelf untouched since their return.)
Personally, I can't stand their little binocular. It is dim, dull, hard to use, can't resolve detail worth a d#@&, and is otherwise just miserable. I would like the Leica but, can't afford it so, I've always tried to find something in a "happy medium," hence the various Pentax, Bushnell, etc. models. What I think I really want is the Nikon LXL, which is supposed to be the Leica's equal only a bit less expensive.
I just seem to be getting more and more picky as I get older and the "happy medium" just doesn't seem so happy anymore.