You'll find that while they have a smoother attack characteristic than conventional singles, Bill's dual blade pickups are also considerably clearer than most. They have all the dynamics and treble extension of the best singles. The only thing that seems "bucker-ish" is that smoother attack quality, but that shouldn't be taken to mean it's compressed or somehow lacking in dynamics, the way many buckers are.
If you order the L45/L48 combo, I'd also recommend getting some low capacitance cables and plugs from Bill and Becky. It helps get additional high end extension to ensure you're bringing the most you can to your amp and speaker, but it also helps to be absolutely sure you're not creating any resonances between 3-5 kHz that lend themselves to unflattering guitar tones, especially with the bridge pickup. It'll help you get a bridge position free of any edgy/harsh/icepicky tonality that performs better than almost anything most have experience with. Worth noting: the L45 is Strat-sized, so if you don't want to change your pickguard, you might instead opt for the L202TN which will get you a beautiful and smooth "single-coil tone" as well.