I'm with Smelkus on this...I rarely wipe sd-ext anymore and can't say I've had any real issues. App+Data seems to stay intact. Maybe if you go from rom with a2sd to one w/o or vice versa there could be an issue???...maybe one of our a2sd experts can jump in.
Same here...I haven't wiped sd-ext in who knows how long. I have jumped between different ROMs without any issues...just gotta read/ask/find out if the ROM you flashing has dta2sd built in, or not (in which case I just flash it myself) .
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