I don't own one but have seen the Zero-Five 43' verticals a few times and IMO its claim to fame is it's so strong it can actually self-support if well installed. That's not easily accomplished with 43' of aluminum tubing standing on end. Otherwise, 43' of vertical wire supported by a high tree limb and fed at ground level is the same antenna. It's resonant just above 30m and 15m where it's a very high-Z feedpoint, so a Unun with a ratio of >>9:1 would be more appropriate for those bands. It's about 1/4-WL on 60m where it's a low-Z feedpoint, so a Unun ratio of 1:1 would be much more appropriate on that band. Somewhere around 4:1 or 9:1 is probably a reasonable compromise on some other bands. If you run any serious power, the Unun needs to be robust! High current where it's current-fed and very high voltages where it's voltage-fed, and a single length antenna used on a lot of bands will have this problem no matter who makes it. A very good "remote" tuner at the base of the antenna may solve a lot of problems but also add quite a lot of expense, especially if high power operation is a goal. The radial field needs to be as good as you can make it. Where it's nearly voltage-fed, the ground losses will be lower; where it's nearly current-fed, the ground losses will be higher; a good compromise is probably at least sixteen radials ~43' long each, at least as a starting point. Again, I'd say the "big thing" about the Zero-Five is its mechanical construction: Very nicely done and very robust. But if you can add some lightly tensioned rope guys to the vertical, lesser construction should work fine also.