The wheel-furler has been available for a long time, but mainly for big assyms. These are only furled, never reefed. I don't understand what factors weigh on the distinctions.
I recall that either Harken or Schaefer also offers a wheel-furler, though specifically denying that it's appropriate for reefing. Clearly we need both reefing & furling on a Mac's headsail. A Mac owner posted here, long ago, that he used it for reefing anyhow, in spite of the mfg warning.
Facnor has just released the new product - price unknown - saw an advert in latest Sail or Sailing mag, center pages.
Skimming their webpages (excerpted below) though, I'm guessing it is very expensive, prolly targeted at big boats.
Facnor Webpage wrote:From racing to cruising with the RC furler
= = => The “Future Furler” allows sailors to reef headsails quickly and safely using the same innovative system used by single-handed and multihull ocean racing yachts. The continuous line system eliminates the possibilty of drum over-rides with a single loop of line operating a large diameter drum.
= = => The drum is specially designed to tightly grip the furling line and has more turning power than traditional furling units. It is fitted with fair leads and a stainless steel line guide that securely hold the line onto the drum even in the roughest conditions. The low, flat design keeps the jib tack close to the deck and allows for the longest possible luff length, which is ideal for racing. The furling drum can be retrofitted to most existing Facnor furling units and is easy to install.
ETA:
seems to me that the torsion imparted by a line-on-drum versus a continuous line is immaterial ... both the wheel and the drum must twist the luff foil, into which wind forces are transferred.