Hadesnight- Sorry, can't help with the Glanz, but most people who've used it seem to like it.
I'm *NOT* a fan of the one-product-line approach, but you could do worse than 1Z by a long shot. But check out the following before you buy their compound:
Bence- Noting that I share your enthusiasm for 1Z stuff (including the older polishes, even the consumer-line ones which I still recommend to newbies), I do think that M105 is much better than 1Z Pasta Intensiv, at least for me. Better correction, less marring from the initial cut (I've had cases where,used by hand, the 1Z left incredibly deep "tracers" that were very difficult to fix; like a wetsand that went wrong), faster, better final finish...not quite as clean a product but still simply better IMO. Thought I'd post that (again) since I resisted the M105 for ages, thinking that I was doing just fine with 1Z.
OTOH, I sometimes prefer 1Z High Gloss over M205, an large part because the 1Z is SO much cleaner, with virtually none of the oiliness issues that can plague M205.