The HT2-TL and the original SongTowers are two different animals. I haven't heard the new Songtower II, they look like an excellent upgrade.
In the photos, the HT2-TL and SongTowers look similar in size but in reality the HT2-TL is a lot bigger. The SongTower's can disappear in a tastefully designed room, not so the HT2-TL's. My HT2-TL's have custom mesquite veneer and front baffle plus DIY No Rez damping and weigh 100 lbs each, the SongTower II weigh 54 lbs each.
Speaking of the room, the HT2-TL's put out a lot of bass, they could easily overpower a small room. I have a 326 sq. ft. L-shaped room (2608 cubic ft.) and the bass is perfect. I added a REL Gibraltar G2 subwoofer (discontinued) and the bass is now better than perfect, flat down to 20 Hz. I mentioned the sub because the Seas Excel W18 drivers are fast and accurate without being analytical. Only a fast sealed sub will disappear, it's not about bass, it's about space and REL subs make space better than any sub I have heard.
Let's talk about power. Frank Van Alstine drives his SongTower II's with his 60 watt per channel
AVA SET 120 Control amp. The HT2-TL speakers love more watts than that. The AVA Vision SET 400 with 225 watts per channel is a perfect match, not too much, not too little. I did try the speakers with the PS Audio Stellar M1200 monoblock amps that have 600 watts per channel and even I had to admit it was overkill... but fun. The HT2-TLs never gave up, we reached our limit way before the speakers did.
The HT2-TL responds well to system changes, differences in cables, electronics, and recordings are easily heard, the bonus is the sound is always musical. The mids and highs are never emphasized but clearly represented as they should be, in a balanced way. No matter how expensive the electronics or cables get, the HT2-TL is never outclassed, the sound just keeps getting better and better.