Well depending on how you solder down the USB port case modding is not needed per say, and also i only used a small cutter for the case, didn't need to get the proxxon out or anything.

Again case modding is only needed if the USB won't sit flush when putting the N900 back together.

And in light of only using soldering iron and small cutters then you cant really argue on price, the 2-component (which can be very fluent or hard depending on type) can be pretty expensive i might add, i use it alot for various purposes and i have countless of 2-component glue laying around.

Last but not least, lets say something goes wrong anyway with either mod, whats easiest to correct?
- unsolder the port and fixing it
or
- trying to get glue off that was designed not to come off? (this is not hot-glue we are talking about)