I like Super Tigre's too, but don't recommend them to beginners.
More Magnum opinions from this link
http://search.rcuniverse.com/search....archwhere=both
What you'll learn is each manufacturer's design calls for different set ups. OS can run well with 10-15% nitro content, but not Rossi, Webra, Picco, Super Tigre, and others with more compression. Some say synthetic oil and brand Y glow plug is needed for such and such an engine to not deadstick. Some say you got to chase backplate and carb leak issues, even with some OS.

Beginners have a lot of hurdles to jump. Why add to it with a learning curve on poor/inconsistent quality control in a low dollar engine?
You got to crunch the overall data to get an idea of what really works keeping perspective of what a beginner faces at the trainer plane level. A simple and fast cursory search on this forum alone, for magnum problems, are listed on over 60 pages containing 30 links per page.
Do a OS peel search, lots of good and bad across the board I guess.