I've tried several different types of steaks SV, everything from choice flat iron to Prime strips from Costco. My take is about the same as Bentleys, tender yes, as flavorful no.
I often season mine with Montreal steak and put some olive oil in the bag and cook 1-2 hours sous vide depending on the thickness. The Prime strips I seared over an open charcoal grill for a couple minutes per side flipping every 30 seconds or so and they were spectacular steaks, but mostly because they were Prime strips. Steaks are definitely more tender sous vide. However, I've also had some relatively flavorless steaks from SV too. I cooked some flat irons on my gasser last night (which I rarely use anymore but was in a big hurry) and they had more flavor than several SV steaks I've cooked.
I've seared different SV steaks in a skillet, on the gasser, on the pellet grill with grillgrates, etc. all with pretty similar results flavor wise. Would I buy another SV cooker? I love trying every cooking gadget, but I'm not sure I would. I bought it trying to match the $50 ala cart Prime steakhouse steak, but haven't found that yet. However, I haven't tried the other stuff I probably should like veggies, chicken, and roasts. Maybe then I'll like it more. Maybe the right pieces of meat that have more natural flavor would be better. I am tempted to try to use it to make Steak DeBurgo since that's more about the sauce than the cook flavoring the steak. Maybe I need at a lower temp via SV and cook longer on a grill after?