Speedway roller rockers for small block?

Anyone tried the Speedway or any other "economy" priced roller rockers for la small blocks. I've always been a believer that if something sounds too good to be true, it probably is! I know Harland Sharp makes quality rockers, but there seems to be a lot of roller kits out for 1/3 the price of the sharps. Wondering if anyone has any experience with these. I've always been a fan of the old 273 adjustables, but seems you can buy a new set of these rollers for less then the used 273 pieces. Guess if they fly apart or don't ride on the valve stem where there supposed to, they're not a bargain at ANY price. Theyl be used on a 360 street motor with single springs and a nos Direct Connection 528" 286 solid cam I've had for about 30 years Still in the box