Ive had mine for 18 month, no issues like that for me.
Hard to know what the guy really meant by the comments without knowing the full context. Id also like to know what he was recommending INSTEAD of the Silvia.
I do think there is a bit of self-fulfilling bias regarding the Silvia. It seems to be the one you see the most written about. That certainly influenced me when I got the upgrade bug. However, if they were always being repaired, youd read articles about that too!
Do a search on one of the plastic super-auto types and see what kind of articles are returned.