well if you build it right it will be solid and the only work you will have to do is changing seals in the cylinder and charging. you can run accumulators and it will ride like a caddy but might take some trial and error with pressures in the accumulator. and if you do accumulators you should hone out the inside of the cylinders where the seals ride and that will make the seals last way longer. if you build it right and dont go cheap with fittings,check valves, and hoses you will have a very solid settup.
the accord wagon in my profile was the first thing i have juiced and after i learned you need good quality fittings i was good to go. i had a prohopper kit and teh fitting they provide are crap. i went to the parker store and replaced all the fittings and checkvalves with parker and i was good to go, didnt have to work on anything for close to a year. i have a fullsize now on bags and i miss the hydraulics bad, but i told myself i would give air a chance and run it longer and make my choice if i want to swap it out for hydraulics. i hope this helped. also go to
www.layitlow.com you will learn a ton over there. good luck on whatever road you choose