Calexico, hmmm.
1) Awesome Customs service and NO line.
2) VFR only.
3) Runway bumpy enough that pax think you have a flat.
4) Wind? Yeah, they got wind and it's always blowin' hard right across the runway.
I use Calexico almost exclusively. However, Yuma seems to be a fantastic place to clear. Loooong runways, Customs officers easier than Stifler's mom and dirt cheap Jet-A. If you're ending up in the LA area, it's only about 5 minutes extra flying and well worth the extra time as far as I can tell. Good luck.