so ive been running an RTL-SDR v3 dongle for maybe two years now, mostly just doing aircraft ADS-B, some weather satellite stuff with WXtoImg, and occasionally poking around the HF bands with the direct sampling mod. its worked fine honestly but i keep reading about the RSP1A and the specs look way better on paper. wider dynamic range, better ADC, the 1kHz to 2GHz coverage without needing a separate upconverter etc.

my actual question is whether the jump in performance is noticeable in day to day use or if its one of those things where on paper it looks great but practically you wont really tell the difference unless youre doing something specific. ive got a decent antenna setup, W6LVP magnetic loop for HF and a discone up on the roof for VHF/UHF so the antennas arent really the limiting factor anymore i think.

also curious if anyone has run both side by side. im not made of money but the RSP1A isnt crazy expensive either so its not a huge deal if it turns out to be worth it. just dont want to spend the cash and feel like nothing changed

ran both for a while, had the v3 dongle then picked up an RSP1A maybe 18 months ago. the difference on HF is pretty real, not night and day but definitely noticeable. the rtl with direct sampling always felt a bit rough to me, lots of birdies and the noise floor seemed higher than it should be. the RSP1A cleaned that up a fair bit. on VHF and up honestly they perform more similarly than the specs would have you believe for casual monitoring.

the bigger thing for me was the SDRuno software that comes with it. its not everyones cup of tea interface wise but it has some nice features. though i mostly end up using SDR# anyway out of habit. if youre already happy with what you're recieving on the rtl i wouldnt say its a must buy, but if HF is where you spend most of your time its probably worth it

HackRF guy here so take this with a grain of salt but have you thought about just getting an upconverter for the RTL instead? ham it up plus or something similar. way cheaper than the RSP1A and HF performance gets pretty decent. i did that route before eventually going HackRF for the TX capability (not that i do much with it tbh). RSP1A is a solid device though, no complaints from people i know who run them. just another option worth considering before spending more