Harley Benton AirBorne Pro 5.8Ghz Instrument

This is a fairly new product, but seems to provide a great value for the money. A more professional product would be 4-5 times the price.

The transmitter/receiver adds 5.87 ms latency - I measured it accurately. This is barely noticeable on its own, but will of course add to latency elsewhere in your chain. The transmitter seems to apply a high-pass filter with a cutoff around 45 Hz, which is certainly no problem for guitar. It also adds a little noise, but quite low and "white", so again no problem.
I've experienced no dropouts or connection issues, but have so far only used it at home.

When testing the sound quality with a guitar with an active pickup, the AirBorne was transparent if the Cable Tone filtering was set to off. Note that 'off' is all the way clockwise - opposite of what one might expect. Hence CCW = more filtering.
In an A/B setup with a strat with passive pickups and 3-6 m guitar cable the Cable Tone came in handy, in order to match the treble roll-off due to the guitar cable.
When switching between a wired and wireless connection to the same effects and amp, it's essential to compensate for the effect of the cable. Otherwise separate presets with different EQ would be required to accommodate this.

Pros:
- Great value for money
- Transparent sound quality
- Cable Tone filter useful, switching between playing wired and wireless
- Convenient built-in charger in the receiver
- Colour-coded channels, to easily see link between transmitter and receiver
- Potentially 5.8 GHz is less crowded than the 2.4 GHz band

Cons:
- Impossible to tell the difference between Power and Channel buttons (before pressing it), with the transmitter plugged in
- Counter-intuitive direction of the Cable Tone knob
- Low-battery indicator seemed to kick in just shortly before the transmitter switched off
- Might not trust the "dongle" transmitter in a live performance, but would prefer one tied to the strap.

Got this in preference to the more simple plug to plug systems, as it advertises an onboard charging facility & footswitch-operated tuner - which allows the user to noiselessly change between guitars.
Good - the signal is clean, you also have a tone control to compensate for high frequency loss, and range is pretty good. I can go out front & listen from at least 15m away whilst soundchecking, which is more than enough for a product in this price range I think. Frequency selection is trouble free & reliable also, & I've not experienced any problems playing indoor or outdoor gigs from interference, so happy on that front. The tuner is, er well, a tuner, but as a bonus the footswitch works well as a noiseless on/off whilst changing guitars, and overall unit construction is solid.
Bad - Main reason for loss of stars is the charger function. The jackplug "fob" is supposed to lock magnetically to the main unit, using a similar principle to the "Magsafe" on Apple MacBooks, but it's nowhere near useable. The magnet seems too weak to hold the fob in place & so it never charges. The supplied charger cable is an alternative, but again it's just too short for practical use IMO, so budget for another, longer cable as the fob uses a rechargeable battery only. And charge up several hours before gigging, as it takes a while! Battery life, is thankfully quite good, I've used it live for 3 hrs at a time & it's never run out yet.
It's basically a good product, as if you need the sort of functionality described above there are not too many alternatives out there.