I never said this stick had Happ parts; I said mine did because I replaced them. It’s a very cheap replacement that can be done with a crimper and no soldering. If you check the converter thread, you can make sure that you’ll be able to get a converter with no lag.
That said, if you want Sanwa, you may want to pass. It’s possible to fit a Sanwa properly in here, but I haven’t seen anyone do it without using a router or similar tool.
For what it’s worth, IL’s are supposed to be better than Happ for sticks (they made most of the Happ’s back in the arcade days for most Americans), but I have a Happ, and I’ve never experienced the stick to the side issue.
The default stick looks like a Happ, but it’s a Chinese stick with massive leaf springs. You really have to dig the corners out a lot compared to anything else to get moves off. I’d recommend changing the buttons too. The default ones aren’t nearly as bad as the stick, but happ buttons are some of the springiest and responsive pushbuttons around. It’s definitely worth the upgrade. Google says 80 australian bucks is about 56 us dollars. I’ve seen these sell for $50-70 US un-modded, and over $80-110 modded recently. I don’t think your re-sale value will go down much either, since most of the current craze seems to center around the japanese parts.