I've been seeing a fair number of these practice types coming online. If you aren't familiar with these they are basically retainer practices that charge upfront for a year at a time, say 2K or so. They restrict membership to 500-600 patients and you have complete access anytime via phone/text/email and they guarantee same day or next day office visit. Some have set up arrangements with concierge practices in other cities in case you get sick while traveling. What are your thoughts about this type of thing? Any of you use these and do you feel the money is well spent?