uha-120 and aha-120 both cost more than arrow 4G and they both are considerably thicker than arrow 4G. I agree the uha-6s mk2 is in price range and I need to say I havent heard that but there is a ood chance it is going to sound better with the OPA 627 upgrade but once again sizewise it is much larger than arrow 4G.
There are many ways we can judge things. I believe shape plays an important role and considering its slim nature the arrow 4G does a decent job. I am sure Robert would have been able to put some better parts to improve the sound but than again it would put it in transportable region not portable. Arrow 4G is truly a portable amp, if size is not an issue there are other option which might provide a marginal better sound than the arrow but I still believe in order to get a better sounding amp than arrow 4G we need to spend a good 200 dollars.
really? i thought the uha is around 180usd and the aha is around 300? i prefer a fully modded cmoy than the arrow and the three amps i mentioned though, since i get to make the sound how i wanted to be. i may make one in the future but i need a slim and long case for it... like the E12 case