I have 8 Peterson System pipes, I enjoy them a lot. I find some tobaccos taste better in System pipes and others taste better in non-System pipes. The smoke is cooler and drier, especially if you pair it with a p-lip. P-lips do two things, 1) aim the smoke at the roof of your mouth 2) they are wider at the bottom than the top, which causes less suction in the bowl. Basically it forces you to slow down your smoking.
As far as cleaning? Not much different, just swab the reservoir area. If you neglect to clean the reservoir area, and leave it for too long, it can be a real bitch to clean.
Standard vs. Premier. Standard is basic, decent briar, nickel mount. Premier is a higher grade of briar, and silver mounted.
System pipes and p-lips, either you love them or hate them, especially the p-lip.