Meng Shilka - beautiful kit with workable tracks but clean-up of the spruce attachments on each link has to be exact for them to connect.
Trumpeter SAM-6 - simple kit, nice missiles. Link&length tracks though. Not a fan of them from when I build one years ago. Will replace these.
Panda Tunguska - horrible kit. POOR fit of parts and really overdone with tiny bits. Non workable individual link tracks. Might replace these too
Panda TOR - such an improvement over the Tunguska. Very detailed radar that went together very well. Also has individual workable tracks
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Currently on the process of priming them all. Each will get a different colour scheme just undecided on which ones yet....