i beg to differ ... but ymmv. i've had bravo, bravo 1.5, indeed 1.5 and indeed g2. i performed the rockgrotto updates on my g2 and then had additional negative feedback mod added to my modded g2. my sunrise v1 prototype was built by Jeremy & it is categorically better in all respects than any of the bravo or indeed variants that i've purchased or had modded. by all respects, i mean using same tubes - frequency response, noise levels, sense of air, soundstaging, depth of image, dynamics, bass response, etc. to be fair, i've had my sunrise modded with negative feedback option as well, but these days, it is operated mostly with 0 dB of negative feedback (i.e. bypassed). also, all music in original source with set-top universal player and nfb-2 as dac: cd, sacd, dvd-a.
these amps were tested with stock t50rp, dbv#3 t50rp, hfi780, rp-htf600, grado hf-2, and superex st-pro-b. & to remove any personal bias, i've had my modded indeed g2 compared against my modded sunrise (both with negative feedback mod set at the bypass position) by a friend who regularly sings in several city choirs & who is blessed with exceptional hearing - he prefers the sunrise, by far, but doesn't consider the modded g2 to be bad. he also thinks the dbv#3 to be an exceptional headphone. disclosure: i've given both products (dbv#3 and sunrise + tubes) to him as gifts.
from an engineering standpoint, are the ccts related? absolutely, but it is the implementation details that make this a tale of two cities ... imo.
better value for the $? in terms of a tube or hybrid, i don't think so ... but against ss such as the O2? this comparison is less clear & boils down to personal preferences between a tube-flavored device vs solid-state. note: i haven't heard the O2, but i am contemplating buying one solely for comparison, even tho my personal preference is still tube.