I have over 500 hours on my RV-6A, so I can probably be of some help here. I've flown your typical GA stuff, Citation, G-IV and now a regional jet. The RV is hands down the most enjoyable flying experience that I have ever had.
As was stated above, all controls are push-pull tubes except the cables to the rudder. The controls are perfectly balanced. Adverse yaw basically doesn't exist. The ailerons are differential freise type. The additional parasitic drag on the low wing balances out the additional induced drag on the high wing.
I have the tip-up canopy. The visibility is unbelievable. Picture the canopy on an f-16. That's the sort of visibility with this canopy.
Performance. Van's numbers are dead on ba!!S accurate, right down to the knot. I have an O-320 swinging a Hatzell C/S. The C/S prop is the way to go with this airplane. I see 163 KTAS at 8,000 ft, burning 8.1 GPH. Initial climb is 1700- 1900 fpm; range is 500 nm with plenty of reserve. 100 lbs baggage and I even put a ski rack through the baggage bulkhead into the tail cone. An 8 hour car ride to Sunday River ski resort is now a 90 minute flight. I routinely fly from New York, up to Maine just to pick up lobsters. I've had the plane all over the country, down to Florida, Jackson, WY, Kalispell, Mt, Oshkosh, etc. Life at 160+ kts is good.
Building. It took me 4.5 yrs. No matter what you do, time will march on, what will you have to show for it? The building was quite enjoyable and relaxing. I've learner many new skills and made a bunch of friends along the way. The experience of taking the first flight in an airplane that you built yourself can't be compared to anything else. Nobody pays any attention when a 152 taxi onto a ramp. The RV always draws a crowd.
MX. Nothing much to talk about here. My RV has been very reliable. A few minor issues, just like any other airplane, during the first 50 hours. Now that I have 500+ hrs, I'm starting to see normal stuff. I replaced tires last year, just replaced a Slick mag, getting ready for new plugs this year, your typical filters, screens, etc. The parts are cheap. I've heard that a mag replacement can cost up to $1300 on a span can. It cost me $450. I just finished an IFR upgrade to the panel and the new blank aluminum panel from Van's cost a whopping $35. I wonder what Cessna charges for a panel? As the builder, I was eligible for a limited repairman certificate. That enables me to perform all '12 month condition inspections' (Annuals are for certified birds).
I figure that I have about $65k into the plane. Most of that cost was a brand new Lycoming, Hatzell and avionics. The airframe was about $15K of the total. Not bad considering that is is a new airplane and the performance associated with it.
Your best bet is to call the EAA
www.eaa.org and find a chapter in your area. Give your local chapter a call and attend their next monthly meeting. With the popularity of the RV's your are almost certain to find a local builder.
Bottom line, Building the RV was one of my greatest accomplishments, most enjoable project, etc, etc. etc.
Check you private messages, I'll send you my email if you need any additional info.