Things took a different turn with 1T-TBC. Long story short; it didn't work so good with problem tapes, I lost my patience and sold it. Pretty horrid results (freezed frames for a long periods of time). The stripe problem was propably due to setting sharpness too high (aka the default). Setting it to lower position fixed it (propably, didn't test this one a lot anymore). I'm not saying it's useless. It works fine with many tapes but I rather have a device that works always when working with dozens of tapes a week.
This might've been PAL problem and it works better in NTSC? Who knows.
I must say I'm very disapointed with their tech support which touts being "the best in industry" but I haven't received single reply to my queries after several months.
Also discovered what's causing the problems with my TBC-1000. The input connector is somewhat borked and occasionally gives worse results. Slight push will fix it usually. I've ordered new connectors (and I'm going to throw away the 1->4 distribution amplifier and connect in+out directly to the TBC-100 -board).
I did a test regarding sharpness and comb filter
at doom9 and the results might be relevant to readers here so I'll repost the images;
Y*C = Composite
Y/C = S-video
DVD (Y*C)> 1T-TBC (Y/C)> Sweetspot/PDI Deluxe
http://www.siluriformes.net/doom9/1T-TBC_bleeding.png
http://www.siluriformes.net/doom9/1T-TBC_resolution.png
http://www.siluriformes.net/doom9/1T...tion_lines.png
DVD (Y*C)> TBC-1000 (Y/C)> Sweetspot/PDI Deluxe
http://www.siluriformes.net/doom9/TBC-1000_bleeding.png
http://www.siluriformes.net/doom9/TB...resolution.png
http://www.siluriformes.net/doom9/TB...tion_lines.png
DVD (Y*C)> Sweetspot/PDI Deluxe
http://www.siluriformes.net/doom9/PD...t_bleeding.png
http://www.siluriformes.net/doom9/PD...resolution.png
http://www.siluriformes.net/doom9/PD...tion_lines.png