Wow, I don't even know how to respond to that. Here's the deal.
I spent about 5 years messing with car audio, having very little money, changing from this cheap amp to that cheap amp. Legacy, pyramid, targa, american pro, and currently Lanzar Vibe's. I've not personally owned, but have had the opportunity to hear RF and old school RF, old school optidrive, Alpine, ppi, and several others. Yes, I plug lanzar all the time. People ask for a suggestion for affordable amps. Well, my suggestion is vibe.
Kid, is that such an issue with you that you have to comment on it every time I make a suggestion?? I sense you paid hundreds more for your amps than your friends did and their set-ups sound just as good as yours do so you feel the need to defend your money "well-wasted". That is assuming you have friends.
Of course Helix would be a great amp. Why not Zapco? PPI? Maybe Xtant? Well hell, Mcintosh? (Insert ultra-expensive "all-image" amp brand here)
The point is the guy is obviously looking for something halfway affordable. Vibe simply fits the requirements. Would you want to go try to compete running all vibe amps? Probably not, but they will give you respectable sound, whether we're talking $100 or $500.
I'm going to stick my neck out here...The helix, rated at 60x4 says Kid, probably puts out closer to 75, maybe 85x4. The Vibe, rated at 100x4, will probably actually give you 80, maybe 90x4. I'd be willing to bet, well, I know, that the audible difference between the 2 amps with the crossovers turned off would be un-noticable, if anything the vibe may sound a little better. The money you spend on a $500 300 watt amp is not for sound quality, or "clarity", or "warmth" or whatever else you want to call it. It's for under-ratedness, precision x/o's, and the assumtion that it will last for years.
All I'm trying to say is, if you have $500, get a $500 amp and I'm sure it will sound great. But if you have $200, then the vibe's will work just fine.
I've said my peace...for now.